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| SM8230A NIPPON PRECISION CIRCUITS INC. Tone Dialer with Built-in Piezo Driver PINOUT OVERVIEW The SM8230A is a dual-tone signal generator LSI developed for DTMF (dual tone multi-frequency) dialing. It features a built-in piezo-electric speaker driver for direct connection to a piezo-electric buzzer. The DTMF frequencies can be set to correspond to the DTMF standards of any country. The output level is also adjustable under software control. These features, combined with its small package and low power dissipation, make the SM8230A a very use device to use. SD SCL OE VSS 1 8 VDD BZH BZL 8230AS 4 5 CLK PACKAGE DIMENSIONS FEATURES s s s s s s s 3-line serial interface to external CPU 2 independent, adjustable frequency outputs Piezo driver for direct connection to a piezoelectric buzzer 4 system clock frequencies selectable (480 kHz, 960 kHz, 1.92 MHz, 3.84 MHz) 2.6 to 3.3 V supply voltage Low current consumption * 3.0 mA (max) operating current * 1 A (max) standby current 8-pin plastic SOP 4.4 0.2 6.2 0.3 5.2 0.3 0.15- 0.05 + 0.10 0.05 0.05 1.5 0.1 1.27 0.4 0.1 0 10 0.4 0.2 NIPPON PRECISION CIRCUITS--1 SM8230A BLOCK DIAGRAM VDD Programmable Counter High Group ROM D/A Converter Output Control BZH SD SCL OE LATCH SELECTOR CLK VSS Programmable Counter Low Group ROM D/A Converter Output Control BZL PIN DESCRIPTION Number 1 2 3 4 5 6 7 8 Name SD SCL OE VSS CLK BZL BZH VDD I/O I I I - I O O - Serial data input Serial data transfer clock input. (For valid transfer, OE must stay LOW for 16 clock cycles.) DTMF output enable/serial data transfer select input. Serial data transfer is selected when LOW. Ground System clock input. The clock can be set to one of four frequencies (480 kHz, 960 kHz, 1.92 MHz, 3.84 MHz). DTMF low-frequency group analog output DTMF high-frequency group analog output Supply voltage Description NIPPON PRECISION CIRCUITS--2 SM8230A SPECIFICATIONS Absolute Maximum Ratings VSS = 0 V P arameter Supply voltage range Input voltage range Output voltage range Storage temperature range Power dissipation Soldering temperature Soldering time Symbol V DD V IN VOUT Tstg PD Tsld tsld Rating -0.3 to 7.0 V SS - 0.3 to V DD + 0.3 V SS - 0.3 to V DD + 0.3 -55 to 125 250 255 10 Unit V V V C mW C s Recommended Operating Conditions VSS = 0 V Rating P arameter Supply voltage range Operating temperature Symbol V DD Topr Condition min 2.6 -20 typ 3.0 25 max 3.3 70 V C Unit DC Characteristics VDD = 2.6 to 3.3V, VSS = 0 V, Ta = -20 to 70 C Rating P arameter Symbol Condition min Operating current consumption Standby current consumption Input voltage (all inputs) Input leakage current BZH/BZL tone output voltage BZH/BZL tone output adjustment step BZH/BZL tone output absolute error BZH/BZL tone output impedance IDD IST V IH V IL IIL VBZO D RES D LIN ZOUT V ZBO levels V DD = 3.0 V, Ta = 25 C, fCLK = 480 kHz V DD = 3.3 V, OE = LOW HIGH-level input LOW-level input HIGH/LOW-level input 0 dB output level - - 1.1 V SS -1 0.86VDD - -1 100 typ 1.5 - - - - 0.93VDD 1.0 - 150 max 3 1 V DD 0.6 1 1.0VDD - 1 200 A Vp-p dB dB mA A V Unit NIPPON PRECISION CIRCUITS--3 SM8230A AC Characteristics VDD = 2.6 to 3.3V, VSS = 0 V, Ta = -20 to 70 C Rating P arameter Symbol f DIS tCLK tCLKL tCLKH tSUOE tHDOE tSCL tSCLL tSCLH tSUD tHDD Between SD and SCL 100 - - ns SCL input waveform Between OE and SCL 100 1 400 400 100 - - - - - - - - - - ns s ns ns ns CLK input waveform Condition min Tone output frequency error Tone distortion1 CLK cycle time CLK LOW-level pulsewidth CLK HIGH-level pulsewidth OE setup time OE hold time SCL cycle time SCL LOW-level pulsewidth SCL HIGH-level pulsewidth Input data setup time Input data hold time fCLK = 3.84 MHz, no deviation BZH/BZL - - 250 100 100 100 typ - 5 - - - - max 0.37 10 - - - - % % ns ns ns ns Unit 1. Ta = -10 to 70C, THD + N (10 Hz to 500 kHz), no load System clock input timing CLK tCLKL tCLK Serial data transfer timing tCLKH OE SCL SD 1 DATA(b15) 2 DATA(b14) 16 DATA(b0) tSUD tSUOE tSCLH tHDD tSCL tSCLL tHDOE NIPPON PRECISION CIRCUITS--4 SM8230A FUNCTIONAL DESCRIPTION Serial Interface Data is transferred in 16-bit units by writing commands over a 3-line serial interface comprising OE (output enable), SCL (serial clock) and SD (serial data input). Note that data transfer is unidirectional; no data is output from the SM8230A. The operating sequence is described below. Port OE SCL SD CLK BZH R CPU Serial Clock Serial Data (Clock) SM8230 BZL Piezo Buzzer Figure 1. Serial interface connection example Command transfer Data can be transferred when OE goes LOW. Data is transferred in 16-bit units in sync with the rising edge of the SCL clock. Note that when OE is LOW and both SD and SCL are tied LOW, the current consumption is less than 1 A (standby mode). The internal states are undefined when power is first applied. DTMF analog signal output Data transfer stops and DTMF analog signal output starts when OE goes HIGH, as shown in figure 2. OE 1 SCL b15 b14 b13 b12 b11 b10 SD BZL BZH 0 MSB Serial data transmission Piezo buzzer output 2 3 4 5 6 7 b9 8 b8 9 b7 10 b6 11 b5 12 b4 13 b3 14 b2 15 b1 16 b0 LSB 0 CK1 CK0 FH1 FH0 GH3 GH2 GH1 GH0 FL1 FL0 GL3 GL2 GL1 GL0 Low frequency group output High frequency group output Figure 2. Serial data transfer timing NIPPON PRECISION CIRCUITS--5 SM8230A Transfer Command Specifications The transfer data code format is shown in figure 3. Data is transferred with the MSB as the leading bit. The data sets the input clock, high-frequency group and low-frequency group frequencies, and the output levels. The commands are shown in tables 1 to 4. b15(MSB) b0(LSB) 0 0 CK1 CK0 FH1 FH0 GH3 GH2 GH1 GH0 FL1 FL0 GL3 GL2 GL1 GL0 Low group output level set. Low group frequency set. High group output level set. High group frequency set. CLK pin input frequency set. Set (b14, b15) = (0, 0) for normal operation. Figure 3. Transfer command format CK command (CK1, CK0) These bits set the frequency of the input clock on CLK. The frequency can be set to 1x, 2x, 4x, and 8x multiples of 480 kHz. The input code and the corresponding clock frequency are shown in table 1. Table 1. CK command CK1 0 0 1 1 CK0 0 1 0 1 CLK input clock frequency 480 kHz 960 kHz 1.92 MHz 3.84 MHz FH1 FH0 FH/FL command (HF1, FH0 / FL1, FL0) These bits set the DTMF signal high-frequency and low-frequency group frequencies, respectively. The input code, the corresponding group frequency specification, the design value and frequency deviation are shown in tables 2 and 3. Note that the design value and frequency deviation are calculated values assuming a deviation-free system clock input on CLK. Table 2. FH command DTMF frequency (Hz) 1209 1336 1477 1633 Design value (Hz) 1212.1 1333.3 1481.5 1632.7 D e viation (%) +0.26 -0.20 +0.30 -0.02 0 0 1 1 0 1 0 1 Table 3. FL command FH1 FH0 DTMF frequency (Hz) 697 770 852 941 Design value (Hz) 697.7 769.2 851.1 937.5 D e viation (%) +0.10 -0.10 -0.11 -0.37 0 0 1 1 0 1 0 1 NIPPON PRECISION CIRCUITS--6 SM8230A GH/GL command (GH3 to GH0, GL3 to GL0) These bits set the output levels of the high-frequency group and low-frequency group outputs, respectively. The input code and the corresponding output level are shown in table 4. Note that the 0 dB point is typically 93% of the supply voltage. Any value above 0 dB results in amplitude clipping of the output waveform. Table 4. GH/GL command GH3/GL 3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 GH2/GL 2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 GH1/GL 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 GH0/GL 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 Output level -9 dB -8 dB -7 dB -6 dB -5 dB -4 dB -3 dB -2 dB -1 dB 0 dB 1 dB 2 dB 3 dB 4 dB 5 dB 6 dB NIPPON PRECISION CIRCUITS INC. reserves the right to make changes to the products described in this data sheet in order to improve the design or performance and to supply the best possible products. Nippon Precision Circuits Inc. assumes no responsibility for the use of any circuits shown in this data sheet, conveys no license under any patent or other rights, and makes no claim that the circuits are free from patent infringement. Applications for any devices shown in this data sheet are for illustration only and Nippon Precision Circuits Inc. makes no claim or warranty that such applications will be suitable for the use specified without further testing or modification. The products described in this data sheet are not intended to use for the apparatus which influence human lives due to the failure or malfunction of the products. Customers are requested to comply with applicable laws and regulations in effect now and hereinafter, including compliance with export controls on the distribution or dissemination of the products. Customers shall not export, directly or indirectly, any products without first obtaining required licenses and approvals from appropriate government agencies. NIPPON PRECISION CIRCUITS INC. 4-3, 2-chome Fukuzumi Koutou-ku, Tokyo 135-8430, Japan Telephone: 03-3642-6661 Facsimile: 03-3642-6698 NC9614BE 1997.01 NIPPON PRECISION CIRCUITS INC. NIPPON PRECISION CIRCUITS--7 |
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