MA100 uart-to- usb bridge controller this document contains information on a new product under dev elopment by megawin. megawin reserves the right to change or discontinue this product without notice. ? megawin technology co., ltd. 2008 all rights reserved. 2008/12 version a3 megawin features z operating voltage from 4.35v to 5.5v z universal asynchronous serial receiver/trans mitter (uart) to universal serial bus (usb) bridge z high efficient data transfer rate and low cost solution for uart-to-usb bridge, which has to connect 1200bps ~ 57.6kbps uart device . z integrated usb transceiver for low speed usb 1.5mbps specification, version 1.1 z embedded 3.3 v voltage regulator for usb data signals z built-in power-on-reset z supports suspend/normal mode for the power management z 6 mhz external crystal or external ceramic resonator z support optional extern al serial eeprom for usb vid, pid, product re lated string and external setting z leds indicate the activity between usb and uart z usb pc driver is available for microsoft windows 98 se/me/2000/xp z package: ? die form: MA100h ? 28-ssop: MA100l
general description the MA100 is a usb interface to a uart bridge controller, which allows high efficient data transfer rate between a uart device and a usb host. the MA100 is usually used in some existing devices with uart only, and work through it to provide easy connectivity between usb host and uart device. the MA100 will be connected up to 57.6k bps uart, and the usb pc software driver is also supported for the microsoft windows 98 se/me/2000/xp environment. MA100 will be very suitable for hand-held game, data bank, i-toy, and other products that need to download/upload data through the pc system. pin description pin name i/o description tx o uart transmit with an open-drain rx i uart receive with an open drain bs0~2 i test pin lbrs i low baud rate select pin usb_led o led for usb indication tx_led o led for transmit indication rx_led o led for receive indication p0 o output pin -rst i reset pin, low active to0~1 i time-out between rx and usb ee_a0 o external eeprom a0 address pin ee_a1 o external eeprom a1 address pin ee_scl o external eeprom serial clock input pin ee_sda i/o external eeprom serial data pin xtal1 i 6mhz crystal or resonator in xtal2 i 6mhz crystal or resonator out d+ i/o usb data + d- i/o usb data - v cc i voltage supply v ss i ground v3.3 o 3.3v regulated output, a capacitor should be added on this pin 2 MA100 data sheet megawin
pin configuration -rst bs2 bs1 tx_led rx_led usb_led vcc d + nc to1 to0 bs0 nc nc rx tx nc xtal2 xtal1 vss d - v3.3 ee_a1 ee_a0 p0 lbrs ee_sda ee_scl 3 26 4 5 6 7 8 25 24 23 22 21 2 1 28 27 9 10 11 12 20 19 18 17 13 14 16 15 MA100l megawin MA100 data sheet 3
application notice title size document number rev date: sheet of 11 friday, may 19, 2006 megawin MA100 application circuit 1.1 megawin technology inc. a v3.3 1 d- 2 vss 3 xtal1 4 xtal2 5 nc 6 tx 7 rx 8 lbrs 9 p0 10 ee_a0 11 ee_a1 12 ee_scl 13 ee_sda 14 nc 15 nc 16 to0 17 to1 18 nc 19 bs0 20 bs1 21 bs2 22 -rst 23 tx_led 24 rx_led 25 usb_led 26 vcc 27 d+ 28 u1 MA100l d1led d2led d3led usb_led tx_led xtal1 vdd 6mhz xtal2 xtal2 vcc_uart vcc_uart if the power of device a is more than 4.0v, otherwise, vcc_uart should be 3.3v applied by MA100. r1 and r2 must be connected to vcc_uart which is the power of device a. vdd r3 30 r4 30 vbus d- d+ vdd gnd u2 a0 1 a1 2 a2 3 gnd 4 vcc 5 wp 6 scl 7 sda 8 u3 at24c08 ee_a0 ee_a1 gnd gnd vdd gnd ee_scl ee_sda d- d+ rx_led tx_led rx usb_led tx xtal1 optional rx tx device a d- tx r1 4.7k d+ r2 4.7k rx v3.3 c4 15p megawin MA100 application circuit c5 1u c2 0.1u c1 10u c3 15p rx_led c6 30p c8 0.1u c7 30p 1. time-out between rx and usb: time-out = 1/baud rate x 2 n , where n=0 for to1=1 and to0=1, n=1 for to1=1 and to0=0; n=2 for to1=0 and to0=1, n=3 for to1=0 and to0=0. 2. tx/rx-pin is an open-drain pin: the tx/rx is an open-drain circuit, so, it decide that how much the suspend current, that is, if the power of device a is more than 4.0v, the vcc_uart?s power must be connect to the power of device a, otherwise, the vcc_uart?s power should be connect to v3.3 pin of the MA100 3. uart?s tx data delay there is a time gap between the bytes transmi tted via MA100?s tx-pin. when the frequency of oscillator is 6 mhz, the minimum time gap is 10 mi croseconds. users need to make sure the uart receiver device could move the data from the receiving buffer during the time gap, 10 us, to avoid it being overwritten by the following byte of data. the signal timing is shown in the following. 4 MA100 data sheet megawin
b0 b1 b2 b3 b4 b5 b6 b7 b0 b1 10 us end bit start bit start bit byte n byte n+1 fig 1. the signal timing of tx-pin absolute maximum rating parameter rating unit supply voltage to ground potential -0.5 to +6.0 v maximum current per pin excluding v dd and v ss 25 ma maximum current out of gnd 100 ma maximum current out of vcc 100 ma ambient operating temperature 0 to +70 c storage temperature -40 to +125 c note: exposure to conditions beyond those listed under abso lute maximum ratings may adversely affect the life and reliability of the device. dc characteristics (v dd -v ss = 5.0 v, f osc = 6mhz, ta = 25 c; unless otherwise specified) parameter sym. conditions min. typ. max. unit op. voltage v dd - 4.35 - 5.5 v op. current i op no load (ext.-v) in normal operation - - 20 ma suspend current i sus no load (ext.-v) - 300 450 a input high voltage v ih - 2 - v dd v input low voltage v il - 0 - 0.8 v usb function static output high v oh rl = 15kohm to vss 2.8 - 3.6 v static output low v ol no load - - 0.3 v differential input sensitivity v di | (d+) ? (d-) | 0.2 - - v differential common mode range v cm include v di range 0.8 - 2.5 v single ended receiver threshold v se - 0.8 - 2.0 v regulator supply voltage v 3.3 i l = 4 ma 3.0 - 3.6 v uart function tx sink current i ol v ol = 0.4v, v dd = 5.0v - 4.0 - ma megawin MA100 data sheet 5
ac characteristics (v dd -v ss = 5.0 v, f osc = 6mhz, ta = 25 c; unless otherwise specified) parameter sym. conditions min. typ. max. unit usb function internal operating frequency f op 1.5 - 1.5 mhz transition time rise time t r 75 - 300 ns fall time t f 75 - 300 ns rise/fall time matching t rfm t r / t f 80 - 125 % output signal crossover voltage v crs 1.3 - 2.0 v low speed data rate t drat 1.4775 - 1.5225 mbps source differential driver jitter to next transition t udj1 -25 - 25 ns for paired transition t udj2 cl=350pf measured at crossover point -14 - 14 ns receiver data jitter tolerance to next transition t djr1 -75 - 75 ns for paired transition t djr2 cl=350pf measured at crossover point -45 - 45 ns source eop width t eopt measured at crossover point 1.25 - 1.50 us differential to eop transition skew t deop measured at crossover point -40 - 100 ns receiver eop width must reject as eop t eopr1 333 - - ns must accept t eopr2 measured at crossover point 667 - - ns uart function duration from end-bit to next start-bit on transmission t td 10 - - us duration from end-bit to next start-bit on receiving t rd 0 - - us 6 MA100 data sheet megawin
package dimensions 28-pin ssop megawin MA100 data sheet 7
pad assignment (0,0) 2 n.c. 1 xtal2 3 n.c. 4 n.c. 5 n.c. 6 tx 7 rx 8 n.c. 9 n.c. 10 n.c. 11 n.c. 12 ? ? ? ? 13 ? ? 14 ? 15 ? ? ? ? 16 ? ? ? ? 17 ? ? ? ? ? 18 ? ? ? ? 19 ? 20 ? 21 ? a ? 22 ? a ? 32 31 30 29 28 27 26 25 24 23 /rst bs2 n.c. n.c. bs1 n.c. n.c. n.c. bs0 n.c. 37 ? ? 36 ? 35 ? ? ? ? 34 ? ? ? ? 33 ? ? ? ? 38 ? ? 39 ? 40 ? ? 41 44 ? ? ? ? ? 43 ? ? 42 ? ? logo 8 MA100 data sheet megawin
revision history version date page description a1 2006/05 initial document a2 2008/06 update document a3 2008/12 formatting megawin MA100 data sheet 9
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