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rev. 1.1 9/05 copyright ? 2005 by silicon laboratories cp2102 cp2102 s ingle -c hip usb to uart b ridge single-chip usb to uart data transfer integrated usb transceiver ; no external resistors required integrated clock; no external crystal required integrated 1024-byte eeprom for vendor id, product id, serial number, power descriptor, release number, and product description strings on-chip power-on reset circuit on-chip voltage regulator: 3.3 v output 100% pin and software compatible with cp2101 usb function controller usb specification 2.0 compliant; full-speed (12 mbps) usb suspend states supported via suspend pins asynchronous serial data bus (uart) all handshaking and modem interface signals data formats supported: - data bits: 5, 6, 7, and 8 - stop bits: 1, 1.5, and 2 - parity: odd, even, mark, space, no parity baud rates: 300 bps to 1 mbits 576 byte receive buffer; 640 byte transmit buffer hardware or x-on/x-off handshaking supported event character support line break transmission virtual com port device drivers works with existing com port pc applications royalty-free distribution license windows 98 se/2000/xp mac os-9 mac os-x linux 2.40 usbxpress? direct driver support example applications upgrade of rs-232 legacy devices to usb cellular phone usb interface cable pda usb interface cable usb to rs-232 serial adapter supply voltage self-powered: 3.0 to 3.6 v usb bus powered: 4.0 to 5.25 v package lead free 28-pin qfn (5 x 5 mm) ordering part number cp2102-gm temperature range: ?40 to +85 c figure 1. example system diagram cp2102 3.3 v voltage regulator 48 mhz oscillator in out suspend suspend 11 12 regin 7 gnd 3 rst 9 d+ 4 d- 5 8 uart ri dcd cts rts rxd txd dsr dtr 2 1 28 27 26 25 24 23 2 3 external rs-232 transceiver or uart circuitry (to external circuitry for usb suspend states) vbus d- d+ gnd 4 5 6 usb connector 6 1 vdd vbus usb function controller usb transceiver 640b tx buffer 576b rx buffer 1024b eeprom vdd d1 d2 d3
cp2102 2 rev. 1.1
cp2102 rev. 1.1 3 t able of c ontents section page 1. system overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 2. absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 3. global dc electri cal characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5 4. pinout and package defini tions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6 5. usb function controller and transceiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 6. asynchronous seri al data bus (uart) interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 7. internal eeprom . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 8. virtual com port device dri vers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 9. usbxpress direct dri ver support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 10. voltage regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 contact information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16
cp2102 4 rev. 1.1 1. system overview the cp2102 is a highly-integrated usb-to-uart bridge controller providing a simple solution for updating rs-232 designs to usb using a minimum of components and pcb space. the cp2102 includes a usb 2.0 full-speed function controller, usb transceiver, oscillator, eepro m, and asynchronous serial data bus (uart) with full modem control signals in a compact 5 x 5 mm qfn-28 package. no other external usb components are required. the on-chip eeprom may be us ed to customize the usb vendor id, pr oduct id, product description string, power descriptor, device release number, and device serial number as desired for oem applications. the eeprom is programmed on-board via th e usb allowing the program ming step to be easily integrated into the product manufacturing and testing process. royalty-free virtual com port (vcp ) device drivers provided by s ilicon laboratories a llow a cp2102-based product to appear as a com port to pc applications. t he cp2102 uart interface implements all rs-232 signals, including control and handshaking sig nals, so existing system firmware does not need to be modified. in many existing rs-232 designs, all that is required to update the design from rs-232 to usb is to replace the rs-232 level-translator with the cp2102. an evaluation kit for the cp2102 (part number: cp2102ek) is available. it includes a cp2102-based usb-to- uart/rs-232 evaluation board, a complete set of vc p device drivers, usb and rs-232 cables, and full documentation. contact a silicon l abs? sales representatives or go to www.silabs.com to order the cp2102 evaluation kit.
cp2102 rev. 1.1 5 2. absolute maximum ratings 3. global dc electrical characteristics table 1. absolute maximum ratings parameter conditions min typ max units ambient temperature under bias ?55 ? 125 c storage temperature ?65 ? 150 c voltage on any i/o pin or rst with respect to gnd ?0.3 ? 5.8 v voltage on v dd with respect to gnd ?0.3 ? 4.2 v maximum total current through v dd and gnd ? ? 500 ma maximum output current sunk by rst or any i/o pin ? ? 100 ma note: stresses above those listed may cause permanent damage to t he device. this is a stress rating only, and functional operation of the devices at or exceeding the conditions in th e operation listings of this sp ecification is not implied. exposure to maximum rating conditions for extended periods may affect device reliability. table 2. global dc electrical characteristics v dd = 2.7 to 3.6 v, ?40 to +85 c unless otherwise specified. parameter conditions min typ max units supply voltage 3.0 3.3 3.6 v supply current v dd = 3.3 v ? 26 ? ma supply current in suspend v dd = 3.3 v ? 330 ? a specified operating temperature range ?40 ? +85 c table 3. uart and suspend i/o dc electrical characteristics v dd = 2.7 to 3.6 v, ?40 to +85 c unless otherwise specified. parameters conditions min typ max units output high voltage i oh =?3ma i oh =?10a i oh =?10ma vdd ? 0.7 vdd ? 0.1 ? ? ? vdd ? 0.8 ? ? ? v output low voltage i ol =8.5ma i ol =10a i ol =25ma ? ? ? ? ? 1.0 0.6 0.1 ? v input high voltage 2.0 ? ? v input low voltage ? ? 0.8 v input leakage current ? 25 50 a
cp2102 6 rev. 1.1 4. pinout and p ackage definitions table 4. cp2102 pin definitions name pin # type description v dd 6 power in power out 3.0?3.6 v power supply voltage input. 3.3 v voltage regulator output. see section 10. gnd 3 ground rst 9 d i/o device reset. open-drain output of internal por or v dd monitor. an external source can initiate a system reset by driving this pin low for at least 15 s. regin 7 power in 5 v regulator input. this pin is the input to the on-chip voltage reg- ulator. vbus 8 d in vbus sense input. this pin should be connected to the vbus sig- nal of a usb network. a 5 v signal on this pin indicates a usb net- work connection. d+ 4 d i/o usb d+ d? 5 d i/o usb d? txd 26 d out asynchronous data output (uart transmit) rxd 25 d in asynchronous data input (uart receive) cts 23* d in clear to send control input (active low) rts 24* d out ready to send control output (active low) dsr 27* d in data set ready control input (active low) dtr 28* d out data terminal read y control output (active low) dcd 1* d in data carrier detect control inpu t (active low) ri 2* d in ring indicator control input (active low) suspend 12* d out this pin is driven high when the cp2102 enters the usb suspend state. suspend 11* d out this pin is driven low when the cp2102 enters the usb suspend state. nc 10, 13?22 these pins should be left unconnected or tied to v dd . *note: pins can be left unconnected when not used.
cp2102 rev. 1.1 7 figure 2. qfn-28 pinout diagram (top view) 4 5 6 7 2 1 3 11 12 13 14 9 8 10 18 17 16 15 20 21 19 25 26 27 28 23 22 24 cp2102 top view dcd ri gnd d+ d- v dd regin vbus rst nc suspend suspend nc nc nc nc nc nc nc nc nc nc cts rts rxd txd dsr dtr gnd gnd
cp2102 8 rev. 1.1 figure 3. qfn-28 package drawing table 5. qfn-28 package dimensions mm min typ max a 0.80 0.90 1.00 a1 0 0.02 0.05 a2 0 0.65 1.00 a3 ? 0.25 ? b 0.18 0.23 0.30 d ? 5.00 ? d2 2.90 3.15 3.35 e ? 5.00 ? e2 2.90 3.15 3.35 e?0.5? l 0.45 0.55 0.65 n?28? nd ? 7 ? ne ? 7 ? r0.09? ? aa ? 0.435 ? bb ? 0.435 ? cc ? 0.18 ? dd ? 0.18 ? 1 e d a2 a a1 e a3 e2 r e l bottom view side view 2 3 4 5 6 7 8 9 10 12 13 14 21 20 19 17 16 15 28 27 26 24 23 22 e2 25 2 d2 11 18 d2 2 6 x e 6 x e detail 1 detail 1 aa bb cc dd b
cp2102 rev. 1.1 9 figure 4. typical qfn-28 landing diagram optional gnd connection b l 0.50 mm 0.30 mm 0.10 mm 0.20 mm 0.85 mm 0.35 mm e e d 0.50 mm 0.30 mm 0.10 mm 0.20 mm 0.85 mm 0.35 mm top view e2 d2 0.20 mm 0.20 mm 0.50 mm 0.50 mm
cp2102 10 rev. 1.1 figure 5. typical qfn-28 solder paste diagram b l 0.50 mm 0.30 mm 0.10 mm 0.20 mm 0.85 mm 0.35 mm e e d 0.50 mm 0.30 mm 0.10 mm 0.20 mm 0.85 mm 0.35 mm top view e2 d2 0.20 mm 0.20 mm 0.50 mm 0.50 mm 0.30 mm 0.20 mm 0.60 mm 0.40 mm 0.70 mm 0.60 mm
cp2102 rev. 1.1 11 5. usb function controller and transceiver the universal serial bus function co ntroller in the cp2102 is a usb 2.0 co mpliant full-speed device with integrated transceiver and on-chip matching and pull-up resistors. the usb function controller manages all data transfers between the usb and the uart as well as command requests generated by the usb host controller and commands for controlling the function of the uart. the usb suspend and resume signals are supported for power management of both the cp2102 device as well as external circuitry. the cp2102 will enter suspend mode when suspend signaling is detected on the bus. on entering suspend mode, the cp2102 asserts the suspend and suspend signals. suspend and suspend are also asserted after a cp2102 reset until device configuration during usb enumeration is complete. the cp2102 exits the suspend mode when any of the following occur: (1) resume signaling is detected or generated, (2) a usb reset signal is detected, or (3) a device reset occurs. on exit of suspend mode, the suspend and suspend signals are de-asserted. both suspend and suspend temporarily float high during a cp2102 reset. if this behavior is undesirable, a strong pulldown (10 k ? ) can be used to ensure suspend remains low during reset. see figure 6 for other recommended options. figure 6. typical connection diagram option 1: a 4.7 k ? pull-up resistor can be added to increase noise immunity. option 2: a 4.7 f tantalum capacitor can be added if powering other devices from the on-chip regulator. option 3: avalanche transient voltage suppression diodes should be added for esd protection. option 3: use littlefuse p/n sp0503baht or equivalent. option 4: 10 k ? resistor to ground to hold suspend low on initial power on or device reset. 1 cp2102 suspend suspend 11 12 regin 7 gnd 3 rst 9 d+ 4 d- 5 8 c2 0.1 f c1 1 f ri dcd cts rts rxd txd dsr dtr 2 1 28 27 26 25 24 23 2 3 external rs-232 transceiver or uart circuitry (to external circuitry for usb suspend states) vbus d- d+ gnd 4 5 6 usb connector 6 vdd vbus vdd r1 4.7 k ? d1 d2 d3 option 1 r2 10 k ? option 4 option 3 c4 4.7 f tant option 2
cp2102 12 rev. 1.1 6. asynchronous serial data bus (uart) interface the cp2102 uart interface consists of the tx (transmit) and rx (receive) data signals as well as the rts, cts, dsr, dtr, dcd, and ri control sign als. the uart supports rts/cts, dsr/dtr, and x-on/x-off handshaking. the uart is programmable to support a variety of data formats and baud rates. the data format and baud rate programmed into the uart is set during com port configuration on the pc. the data formats and baud rates available are listed in table 6. 7. internal eeprom the cp2102 includes an internal eeprom that may be used to cu stomize the usb vendor id, product id, product description string, power desc riptor, device release number, and device serial number as desired for oem applications. customization of t he usb configuration data is optional . if the eeprom is not programmed with oem data, the default configuration data shown in table 7 is used. however, a unique serial number is required for oem applications in which it is possible for multiple cp2102-based devices to be connected to the same pc. the internal eeprom is prog rammed via the usb. this allows the oe m's usb configuration data and serial number to be written to the cp2102 on-board during the manufacturing and testing pr ocess. a stand-alone utility for programming the internal eeprom is available from silic on laboratories. a library of routines provided in the form of a windows ? dll is also available. this library can be used to integrate the eeprom programming step into custom software used by the oem to streamline testing and serial number management during manufacturing. the eeprom has a typical enduranc e of 100,000 write cycl es with a data rete ntion of 100 years. usb descriptors can be locked to prevent future modification. table 6. data formats and baud rates data bits 5, 6, 7, and 8 stop bits 1, 1.5 1 , and 2 parity type none, even, odd, mark, space baud rates 2 300, 600, 1200, 1800, 2400, 4000, 4800, 7200, 9600, 14400, 16000, 19200, 28800, 38400, 51200, 56000, 57600, 64000, 76800, 115200, 128000, 153600, 230400, 250000, 256000, 460800, 500000, 576000, 921600 3 notes: 1. 5-bit only. 2. additional baud rates are supported. see ?an205?. 3. 7 or 8 data bits only. table 7. default usb configuration data name value vendor id 10c4h product id ea60h power descriptor (attributes) 80h power descriptor (max. power) 32h release number 0100h serial number 0001 (63 characters maximum) product description string ?cp2102 usb to uart bridge controller? (126 characters maximum)
cp2102 rev. 1.1 13 8. virtual com port device drivers the cp210x virtual com port (vcp) device drivers allow a cp2102-based device to appear to the pc's application software as an additional com port (in addition to any existi ng hardware com po rts). application software running on the pc accesses the cp2102-bas ed device as it would access a standard hardware com port. however, actual data transfer between the pc and the cp2102 device is performed over the usb. therefore, existing com port applications may be used to transf er data via the usb to the cp2102-based device without modifying the application. contact s ilicon laboratories for the latest list of supported operating systems. note: silicon laboratories? vcp device drivers are required for dev ice operation and are only distributed as part of the cp2102 evaluation kit (part number: cp2102ek). contact any of silicon lab?s sales representatives or go to www.silabs.com to order the cp2102 evaluation kit. the cp210x drivers and programming utilities are subjec t to change without notice. subscription to the website "auto email alert" system fo r automatic notification of updates and the use of the "product update registration" service is recommended. 9. usbxpress direct driver support the silicon labora tories usbxpress for cp210x de velopment kit provides an alte rnate solution for interfacing with cp210x devices than using the virtual com port. no se rial port protocol expertise is required. instead, a simple, high-level application progra m interface (api) is used to prov ide simpler cp201x connectivity and functionality. the usbxpress for cp210x de velopment kit includes win dows device drivers, window s device driver installer and uninstallers, and a host interface function library (h ost api) provided in the form of a windows dynamic link library (dll). the included device drivers and in stallation files support ms windows 98se/2000/xp. 10. voltage regulator the cp2102 includes an on-chip 5 to 3 v voltage regulator. this allows the cp2102 to be configured as either a usb bus-powered device or a usb self-powered device. these configurations are shown in figure 7 and figure 8. when enabled, the 3 v voltage regulator output appears on the v dd pin and can be used to power external 3 v devices. see table 8 for the voltage regulator electrical characteristics. alternatively, if 3 v power is supplied to the v dd pin, the cp2102 can function as a usb self-powered device with the voltage regulator disabled. for this configuration, it is recommended that the regin input be tied to the 3 v net to disable the voltage regulator. this configuration is shown in figure 9. the usb max power and power attributes descriptor must match the device power usage and configuration. see application note ?an144: cp210x cust omization guide? for information on ho w to customize usb descriptors for the cp2102. note: it is recommended that additi onal decoupling capacitance (e.g., 0.1 f in pa rallel with 1.0 f) be provided on the regin input. table 8. voltage regulator electrical specifications ?40 to +85 c unless otherwise specified. parameter conditions min typ max units input voltage range 4.0 ? 5.25 v output voltage output current = 1 to 100 ma* 3.0 3.3 3.6 v vbus detection input threshold 1.0 1.8 4.0 v bias current ? 90 ? a *note: the maximum regulator supply current is 100 ma.
cp2102 14 rev. 1.1 figure 7. configuration 1: usb bus-powered figure 8. configuration 2: usb self-powered voltage regulator (reg0) 5 v in 3 v out vbus sense regin vbus from vbus to 3 v power net device power net v dd cp2102 voltage regulator (reg0) 5 v in 3 v out vbus sense regin vbus to 3v power net device power net v dd cp2102 from 5 v power net from vbus
cp2102 rev. 1.1 15 figure 9. configuration 3: usb self-powered, regulator bypassed voltage regulator (reg0) 5 v in 3 v out vbus sense regin vbus from 3 v power net device power net v dd cp2102 from vbus
cp2102 16 rev. 1.1 document change list revision 1.0 to revision 1.1 updated ?linux 2.40? bullet on page 1. changed mlp to qfn throughout.
cp2102 rev. 1.1 17 n otes :
cp2102 18 rev. 1.1 c ontact i nformation silicon laboratories inc. 4635 boston lane austin, tx 78735 tel: 1+(512) 416-8500 fax: 1+(512) 416-9669 toll free: 1+(877) 444-3032 email: mcuinfo@silabs.com internet: www.silabs.com silicon laboratories, silicon labs, and usbxpre ss are trademarks of silicon laboratories inc. other products or brandnames mentioned herein are trademarks or registered trademarks of their respective holders the information in this document is believed to be accurate in al l respects at the time of publ ication but is subject to change without notice. silicon laboratories assumes no re sponsibility for errors and omissions, and disclaims responsibi lity for any consequen ces resulting from the use of information included herein. additi onally, silicon laborator ies assumes no responsibility for the fun ction- ing of undescribed features or parameters. silicon laboratories re serves the right to make change s without further notice. sili con laboratories makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpos e, nor does silicon laboratories assume any liabi lity arising out of the application or use of any product or circuit, and specifi cally disclaims any and all liability, including without limitation consequential or incident al damages. silicon laboratories product s are not designed, intended, or authorized for use in applications in tended to support or sustain life, or for any other application in which the failure of the silicon laboratories product could create a si tuation where personal injury or death may occur. should buyer purchase or use silicon laboratories prod ucts for any such unintended or unauthorized application, buyer shall indemnify and hold silicon laboratories harmless against all claims and damages.

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