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| SM8230A Tone Dialer with Built-in Piezo Driver 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. FEATURES I I I PINOUT (Top view) I I I I 3-line serial interface to external CPU 2 independent, adjustable frequency outputs Piezo driver for direct connection to a piezo-electric buzzer 4 system clock frequencies selectable (480kHz, 960kHz, 1.92MHz, 3.84MHz) 2.6 to 3.3V supply voltage Low current consumption * 3.0mA (max) operating current * 1A (max) standby current Package: 8-pin plastic SOP SD SCL OE VSS 1 8 VDD BZH BZL 4 5 CLK ORDERING INFORMATION Device SM8230AS Package 8-pin SOP PACKAGE DIMENSIONS (Unit: mm) Peripheral 4.4 0.2 6.2 0.3 5.2 0.3 0.15 - 0.05 + 0.10 0.4 0.1 0.05 0.05 1.5 0.1 1.27 0 to 10 0.4 0.2 SEIKO NPC CORPORATION --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 (480kHz, 960kHz, 1.92MHz, 3.84MHz). DTMF low-frequency group analog output DTMF high-frequency group analog output Supply voltage Description SEIKO NPC CORPORATION --2 SM8230A SPECIFICATIONS Absolute Maximum Ratings VSS = 0V Parameter Supply voltage range Input voltage range Output voltage range Storage temperature range Power dissipation Symbol VDD VIN VOUT Tstg PD Rating -0.3 to 7.0 VSS - 0.3 to VDD + 0.3 VSS - 0.3 to VDD + 0.3 -55 to 125 250 Unit V V V C mW Recommended Operating Conditions VSS = 0V Rating Parameter Supply voltage range Operating temperature Symbol VDD 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 = 0V, Ta = -20 to 70C Rating Parameter 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 VIH VIL IIL VBZO DRES DLIN ZOUT VZBO levels VDD = 3.0V, Ta = 25C, fCLK = 480kHz VDD = 3.3V, OE = LOW HIGH-level input LOW-level input HIGH/LOW-level input 0dB output level - - 1.1 VSS -1 0.86VDD - -1 100 typ 1.5 - - - - 0.93VDD 1.0 - 150 max 3 1 VDD 0.6 1 1.0VDD - 1 200 A Vp-p dB dB mA A V Unit SEIKO NPC CORPORATION --3 SM8230A AC Characteristics VDD = 2.6 to 3.3V, VSS = 0V, Ta = -20 to 70C Rating Parameter 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 = 3.84MHz, 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 (10Hz to 500kHz), 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 SEIKO NPC CORPORATION --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 1A (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 2 3 4 5 6 Serial data transmission Piezo buzzer output 7 8 b8 9 b7 10 b6 11 b5 12 b4 13 b3 14 b2 15 b1 16 b0 LSB b15 b14 b13 b12 b11 b10 b9 SD BZL BZH 0 MSB 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 SEIKO NPC CORPORATION --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 480kHz. 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 480kHz 960kHz 1.92MHz 3.84MHz 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 deviationfree system clock input on CLK. Table 2. FH command FH1 0 0 1 1 FH0 0 1 0 1 DTMF frequency [Hz] 1209 1336 1477 1633 Design value [Hz] 1212.1 1333.3 1481.5 1632.7 Deviation [%] +0.26 -0.20 +0.30 -0.02 Table 3. FL command FH1 0 0 1 1 FH0 0 1 0 1 DTMF frequency [Hz] 697 770 852 941 Design value [Hz] 697.7 769.2 851.1 937.5 Deviation [%] +0.10 -0.10 -0.11 -0.37 SEIKO NPC CORPORATION --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 0dB point is typically 93% of the supply voltage. Any value above 0dB results in amplitude clipping of the output waveform. Table 4. GH/GL command GH3/GL3 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 GH2/GL2 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 GH1/GL1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 GH0/GL0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 Output level -9dB -8dB -7dB -6dB -5dB -4dB -3dB -2dB -1dB 0dB 1dB 2dB 3dB 4dB 5dB 6dB SEIKO NPC CORPORATION --7 SM8230A Please pay your attention to the following points at time of using the products shown in this document. The products shown in this document (hereinafter "Products") are not intended to be used for the apparatus that exerts harmful influence on human lives due to the defects, failure or malfunction of the Products. Customers are requested to obtain prior written agreement for such use from SEIKO NPC CORPORATION (hereinafter "NPC"). Customers shall be solely responsible for, and indemnify and hold NPC free and harmless from, any and all claims, damages, losses, expenses or lawsuits, due to such use without such agreement. NPC reserves the right to change the specifications of the Products in order to improve the characteristic or reliability thereof. NPC makes no claim or warranty that the contents described in this document dose not infringe any intellectual property right or other similar right owned by third parties. Therefore, NPC shall not be responsible for such problems, even if the use is in accordance with the descriptions provided in this document. Any descriptions including applications, circuits, and the parameters of the Products in this document are for reference to use the Products, and shall not be guaranteed free from defect, inapplicability to the design for the mass-production products without further testing or modification. Customers are requested not to export or re-export, directly or indirectly, the Products to any country or any entity not in compliance with or in violation of the national export administration laws, treaties, orders and regulations. Customers are requested appropriately take steps to obtain required permissions or approvals from appropriate government agencies. SEIKO NPC CORPORATION 15-6, Nihombashi-kabutocho, Chuo-ku, Tokyo 103-0026, Japan Telephone: +81-3-6667-6601 Facsimile: +81-3-6667-6611 http://www.npc.co.jp/ Email: sales@npc.co.jp NC9614CE 2006.04 SEIKO NPC CORPORATION --8 |
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