SM8146AD1 EL Driver IC OVERVIEW The SM8146AD1 is a dedicated EL (Electro Luminescence) driver IC, capable of driving EL sheet up to 30cm2 in size. The EL drive circuit uses a technique that generates smooth sine wave EL drive waveforms without an output resistor, which has the advantage of preventing EL sheet audible noise, eliminating the need for additional peripheral components and a corresponding drop in power efficiency. Also, the EL drive voltage is constant-voltage controlled and is unaffected by supply voltage fluctuations, so that there are no EL brightness variations due to supply voltage changes. A dimming function is available under direct control from a microcontroller. The logic HIGH-level input voltage range (ENA, DIM pins) starts at 1.4V, allowing the device to be driven directly without external transistors from a Li-ion battery. FEATURES ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ APPLICATIONS Sine wave EL drive waveforms for low audible noise Constant EL drive voltage independent of supply voltage fluctuations Separate coil and EL drive frequency adjustment Enable function (ENA pin) Dimming function (DIM pin) Direct control capability using 1.8V system CPU (ENA, DIM pins) VIH = 1.4V (min, VDD = 2.5 to 5.5V) 2.5 to 5.5V supply voltage range 170Vp-p (typ) maximum EL drive voltage 250Hz (typ) EL drive frequency (ROCE = 200kΩ) 0.5mA (typ) operating current 1.0µA (max) standby current 220µH (typ) recommended inductance Package: 10-pin SON ■ ■ ■ ■ Cellular phone Portable audio equipment Handy terminal Other portable application STANDARD CIRCUIT CONFIGURATION 100kΩ 1.4V < VIH < VDD 180kΩ OCL VSS OCE LDR Coil 220µH 1.0µF OUT1 Diode OFF ON DIM CHV ENA OUT1 VDD OUT2 OUT2 EL sheet OFF 1.4V < VIH < VDD 30cm2 3.6V High voltage capacitor 0.0022µF 100VDC OUT1 − OUT2 EL drive voltage waveform ORDERING INFORMATION Device Package SM8146AD1 10-pin SON SEIKO NPC CORPORATION —1 SM8146AD1 PINOUT (Top view) OCL 1 VSS 10 OCE LDR DIM CHV ENA OUT1 VDD 5 6 6 OUT2 PIN DESCRIPTION Number Name I/O Function 1 OCL I Coil drive oscillator pin (frequency adjusted using an external resistor) 2 OCE I EL drive oscillator pin (frequency adjusted using an external resistor) 3 DIM Ip1 Dimming signal input pin (connect to ground when not used) 4 ENA Ip1 Enable signal input pin (HIGH: enable, LOW: disable) 5 VDD – Power supply pin 6 OUT2 O EL drive output pin 2 7 OUT1 O EL drive output pin 1 8 CHV I High-voltage DC pin 9 LDR O Coil drive output pin 10 VSS – Ground pin 1. Pull-down resistor built-in BLOCK DIAGRAM EL sheet LDR Output control circuits VDD 1.4V < VIH < VDD CHV OUT1 OUT2 High voltage switching circuit DIM Dividing circuit Dividing circuit Oscillator for boosting voltage Oscillator for EL drive ENA VSS OCL OCE SEIKO NPC CORPORATION —2 SM8146AD1 ELECTRICAL SPECIFICATIONS Absolute Maximum Ratings Parameter Symbol Supply voltage range VDD Input voltage range VIN Conditions All input pins Rating Unit −0.3 to 7.0 V VSS − 0.3 to VDD + 0.3 V CHV output voltage range VCHV CHV pin 0.5 to 120 V LDR output voltage range VLDR LDR pin 0.5 to 120 V OUT1, OUT2 pins 0.5 to 120 V 100 mW −55 to 125 °C OUT1/2 output voltage range Power dissipation Storage temperature range VOUT1/2 PD Ta ≤ 85°C TSTG Recommended Operating Conditions Rating Parameter Symbol Conditions Unit min typ max 3.6 5.5 V 85 °C Supply voltage range VDD2 2.5 Operating temperature range TOPR −40 Operating current1 IDD2 Coil inductance LLDR Including coil current, VDD = 3.0V 60 Including coil current, VDD = 5.0V 36 fLDR = 64kHz mA 220 µH 1. This value includes current tolerance and should not be exceeded. SEIKO NPC CORPORATION —3 SM8146AD1 Electrical Characteristics VDD = 3.6V, VSS = 0V, Ta = 25°C unless otherwise noted Rating Parameter Pin Output voltage Output resistance Symbol Conditions OUT1/2 VOUT VOUT maximum setting LDR RLDR ILDR = 50mA fOCE1 ROCE = 200kΩ Oscillator frequency OCE Frequency variable range fOCE2 Oscillator frequency OCL Frequency variable range fOCL1 OUT1/2 Frequency variable range fOUT1 ROCL = 100kΩ LDR Frequency variable range fLDR1 ROCE = 200kΩ ENA/DIM Input current 70 85 100 V 8.0 12.0 Ω 256 307 205 kHz 410 1536 512 ROCL = 100kΩ kHz 200 250 ENA/DIM = HIGH, VDD = 2.5 to 5.5V VIL ENA/DIM = LOW, VDD = 2.5 to 5.5V ENA/DIM = VDD = 3.6V 300 Hz 102 1500 128 154 kHz 8 VIH 614 1536 31 fLDR2 Input voltage max 32 fOUT2 Coil drive frequency typ 32 fOCL2 Output frequency Unit min 384 1.4 V 0.3 6.0 µA 100 ms 150 kHz IIH ENA tENA Signal input frequency2 DIM fDIM Signal input frequency maximum value at 50% pulse duty tDIMH DIM input signal HIGH-level pulsewidth minimum 3.0 µs tDIML DIM input signal LOW-level pulsewidth minimum 3.0 µs Signal input time2 3.0 9.0 ENA/DIM Rise time1 DIM Operating current VDD IDD1 Excluding coil current 0.5 1.0 mA Standby current VDD ISTB ENA = LOW 0.01 1.0 µA 1. tENA is the rating between the following levels. ENA VSS VDD - 0.5 VDD VSS + 0.5 tENA 2. Design guarantee value SEIKO NPC CORPORATION —4 SM8146AD1 OPERATIONAL DESCRIPTION EL Sheet ■ EL Emission Condition An AC (30Hz to several kHz) high voltage (60Vp-p to several hundred Vp-p) is required for EL emission. The SM8146AD1 supports an EL drive frequency range of 31Hz to 1500Hz and an EL drive voltage range of 86Vp-p to 170Vp-p. ■ EL Life The EL drive frequency and EL drive voltage have a simultaneous affect on the EL brightness and EL life span. The EL life decreases when the EL brightness is high, so an optimized value should be selected for the EL sheet used. The EL life also has an effect on the EL drive voltage waveform. The SM8146AD1 EL drive voltage waveform is a sine wave with small high-harmonic components which helps to extend EL life. ■ EL Audible Noise The EL sheet has a piezoelectric characteristic that generates audible noise when excited by the applied AC high voltage. The SM8146AD1 EL drive voltage waveform is a sine wave with small high-harmonic components which helps to reduce EL audible noise. The EL drive waveform sine wave, generated by the EL drive circuit, does not require an output resistor. Consequently, peripheral components and a corresponding drop in power efficiency can be avoided. ■ EL Drive Voltage (Constant-Voltage Control and Overvoltage Protection) The SM8146AD1 uses constant-voltage control where the EL drive voltage is set to 7 stabilized voltage amplitude levels determined by the IC internal circuitry. The EL drive voltage amplitude is initially set to the default value of 85V, and then changes in sync with the falling edge of each DIM input pulse in the continuous sequence 85V → 78V → 71V → 64V → 57V → 50V → 43V → 0V (OFF) → 85V. The EL drive voltage constant-voltage control not only eliminates EL brightness variations due to supply voltage fluctuations, but also functions as overvoltage protection when the EL load is removed. Interface The SM8146AD1 uses an interface comprised by the ENA and DIM input pins. The ENA and DIM pins have a HIGH-level input voltage range of 1.4V to VDD + 0.3V, enabling direct control from a 1.8V system microcontroller without the need for a voltage converter. Pull-down resistances are built-in. ■ ENA Pin The ENA pin functions as the IC ON/OFF control. The device is enabled when ENA is HIGH, and disabled when ENA is LOW. ■ DIM Pin The DIM pin functions as the EL brightness adjustment (dimming) control. The EL drive voltage amplitude reduces in sync with the falling edge of each DIM input pulse in the continuous sequence 85V → 78V → 71V → 64V → 57V → 50V → 43V → 0V (OFF) → 85V. The DIM pin should be connected to GND when EL brightness control is not used. SEIKO NPC CORPORATION —5 SM8146AD1 EL Brightness Adjustment The SM8146AD1 EL brightness can be adjusted using a combination of two methods: (1) EL drive voltage control and (2) EL drive frequency control. (1) EL Brightness Adjustment using EL Drive Voltage This dimming function changes the EL brightness in response to the EL drive voltage determined by the number of input pulses on the DIM pin. An internal counter is used to count the number of DIM input pulses and the OUT1/OUT2 EL drive voltage amplitude level changes in response, varying the EL brightness. The 3-bit internal counter provides 8-step adjustment (DATA 0 to 7). On the 7th pulse (DATA = 7), the EL sheet is turned OFF. On the 8th pulse (DATA = 0), the voltage is set to the default value (maximum brightness). Since the default value provides the maximum brightness, the DIM pin should be connected to GND when the dimming function is not used. Table 1. OUT1/OUT2 pins voltage amplitude and DIM pin input pulse count DATA DIM pin input pulse count OUT1/OUT2 pins voltage amplitude 0 1 2 3 4 5 6 7 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 85V 78V 71V 64V 57V 50V 43V 0V DATA 0 DATA 7 DATA 1 DIM pin pulse input DATA 6 Standby DATA 2 DATA 5 ENA pin = "High" "Low" ENA pin = "Low" "High" DATA 3 DATA 4 Transition diagram of IC internal state by ENA and DIM pins 100 18 90 Brightness [cd/m2] Voltage amplitude 16 80 14 70 12 60 10 50 8 40 6 30 Brightness 4 20 2 10 0 OUT1/OUT2 pins voltage amplitude [V] 20 0 0 1 2 3 4 5 6 7 DIM pin input pulse DIM pin input pulse count vs. EL brightness, OUT1/OUT2 pins voltage amplitude SEIKO NPC CORPORATION —6 SM8146AD1 1 2 3 4 5 6 7 8 9 10 DIM 85V 78V 85V 71V 64V 57V 50V OUT1 pin Setting voltage amplitude VSS 142Vp-p 170Vp-p 156Vp-p 114Vp-p 128Vp-p 78V 71V 64V 57V 71V 43V 86Vp-p 0V 100Vp-p OUT2 pin Setting voltage amplitude 78V 50V 43V 85V 85V 78V 71V Note: Target values without compensation for voltage accuracy. ■ Input pulse to DIM pin The pulse input to DIM pin is allowed after startup time 1msec that is for initializing IC interior with ENA pin at High level. The output voltage is setup at the initial value DATA0: 85V. The pulse input to DIM pin changes the output pin voltage setting, so that the EL brightness can be adjusted. VDD pin ENA pin VDD − 0.5 VSS + 0.5 Dimming enable tENA < 100msec Startup time < 1msec DIM pin tDIMH > 3µsec Internal status tDIML > 3µsec DATA0: 85V DATA1: 78V DATA2: 71V DATA3: 64V DATA4: 57V DATA5: 50V DATA6: 43V DATA7: 0V SEIKO NPC CORPORATION —7 SM8146AD1 ■ Method to increase EL brightness in steps (Fade-in) The raise of output voltage in steps by the input pulse to DIM pin increases the EL brightness in steps. The timing chart is shown below. Initially the ENA pin is turned to High level, and then the pulse should be input after startup time 1msec of IC interior. Since the output voltage is setup at the initial value DATA0: 85V, when the seven times in a row of pulse are input to DIM pin, the setup value of output voltage becomes DATA7: 0V which is the first tone of fade-in. When the seven times in a row of pulse are input to DIM pin once again after the time tFD, the setup value of output voltage becomes DATA7: 43V which is the second tone of fade-in. If this operation is repeated six times, the brightness becomes maximum value, thus the fade-in would be realized. The frequency of the pulse which is input to DIM pin should be set up at over several tens of kHz. This frequency is adequately higher than the EL driving frequency in order that the EL brightness does not vary during the continuous pulse input. Startup time < 1msec Dimming enable ENA pin DIM data count 7 pulse DATA: 1-7 7 pulse DATA: 0-6 7 pulse 7 pulse 7 pulse DATA: 7-5 DATA: 6-4 DATA: 5-3 7 pulse DATA: 4-2 7 pulse DATA: 3-1 7 pulse DATA: 2-0 DIM pin Internal status DATA0: 85V DATA1: 78V DATA2: 71V DATA3: 64V DATA4: 57V DATA5: 50V DATA6: 43V DATA7: 0V tFD DIM data count DATA:7 DATA:0 DATA:1 DATA:2 DATA:3 DATA:4 DATA:5 DIM pin Internal status DATA0: 85V tDIMH > 3µsec tDIML > 3µsec DATA1: 78V DATA2: 71V DATA3: 64V DATA4: 57V DATA5: 50V DATA6: 43V DATA7: 0V Recommended setting value: tFD = 90msec tDIMH = 25µsec tDIML = 25µsec SEIKO NPC CORPORATION —8 SM8146AD1 (2) EL Brightness Adjustment using EL Drive Frequency This dimming function changes the EL brightness in response to the EL drive frequency determined by the value of the resistance of ROCE connected to the OCE pin. This dimming property should only be set when determining the peripheral components. It is not recommended to vary the EL brightness by switching the ROCE resistance. EL Output Voltage Waveform (Sine Wave) Distortion OUT1 OUT2 OUT1 - OUT2 Flat regions near the waveform peaks of EL driving voltage are generated in principle of operation. They are not failure and do not affect the brightness and the audible noise. OUT1 OUT2 VOUT1 − VOUT2 OUT1 - OUT2 Depending on conditions, the OUT1/OUT2 output waveform may become distorted as shown by the solid line in the figure above. If the booster circuit drive capability is insufficient, the circuit may not be able to provide the boost required to meet the ideal curve shown by the dotted line in the figure above. This condition can be caused by the inductor supply voltage being too low, the inductance value being too high, the inductor frequency being too high, the EL drive frequency being too high, or the EL surface area being too large. SEIKO NPC CORPORATION —9 SM8146AD1 TYPICAL APPLICATION CIRCUIT EL Sheet: 10cm2 Direct power supply from Li-ion secondary battery ROCL OCL VSS OCE LDR DIM CHV ENA OUT1 ROCE VIH > 1.4V OFF ON C1 1.0µF L D OFF EL sheet 10cm2 VIH > 1.4V VDD C2 OUT2 Li-ion battery 3.2 to 4.2V D : TOSHIBA L : TAIYO YUDEN C2 : MURATA VDD [V] IDD [mA] 3.2 to 4.2 L [µH] Figure 1 220 ROCL [kΩ] 220 30.0 200 25.0 180 1SS403 NR4012T221M GRM3192C2A222JA01 ROCE [kΩ] fOUT [Hz] 150 345 120 420 100 500 VOUT [V] Brightness [cd/m2] Other component – Figure 2 Figure 3 – – 35.0 ROCE = 100kΩ 30.0 15.0 160 ROCE = 120kΩ 140 ROCE = 150kΩ ROCE = 120kΩ Brightness [cd/m2 ] VOUT [Vp-p] IDD [mA] ROCE = 150kΩ ROCE = 100kΩ 20.0 ROCE = 100kΩ 10.0 120 5.0 3.40 3.60 3.80 4.00 VDD [V] Figure 1. VDD VS. IDD 4.20 ROCE = 150kΩ 20.0 15.0 10.0 5.0 100 3.20 ROCE = 120kΩ 25.0 3.20 3.40 3.60 3.80 4.00 VDD [V] Figure 2. VDD VS. VOUT 4.20 3.20 3.40 3.60 3.80 4.00 4.20 VDD [V] Figure 3. VDD VS. Brightness SEIKO NPC CORPORATION —10 SM8146AD1 Power supply from stabilizing supply ROCL OCL VSS OCE LDR DIM CHV ENA OUT1 ROCE VIH > 1.4V OFF ON C1 1.0µF L D OFF EL sheet 10cm2 VIH > 1.4V VDD OUT2 C2 Ragulated voltage D : TOSHIBA 1SS403 L : TAIYO YUDEN NR4012T221M C2 : Refer to the table below VDD [V] IDD [mA] 3.0 17.4 3.3 20.6 L [µH] ROCL [kΩ] ROCE [kΩ] fOUT [Hz] VOUT [V] Brightness [cd/m2] Other component 390 200 262 165 19.5 C2: GRM3192C2A222JA01 330 130 392 165 26.1 C2: GRM3192C2A222JA01 220 4.0 20.0 220 91 538 165 31.5 C2: GRM3192C2A222JA01 5.0 15.5 110 91 541 165 32.2 C2: GRM3192C2A472JA01 SEIKO NPC CORPORATION —11 SM8146AD1 EL Sheet: 20cm2 Direct power supply from Li-ion secondary battery ROCL OCL VSS OCE LDR DIM CHV ENA OUT1 VDD OUT2 ROCE VIH > 1.4V ON OFF C1 1.0µF L D OFF EL sheet 20cm2 VIH > 1.4V C2 Li-ion battery 3.2 to 4.2V D : TOSHIBA L : TAIYO YUDEN C2 : MURATA VDD [V] IDD [mA] 3.2 to 4.2 L [µH] Figure 1 220 ROCL [kΩ] 220 30.0 ROCE [kΩ] fOUT [Hz] 270 198 220 241 180 288 VOUT [V] Brightness [cd/m2] Figure 2 Figure 3 – 25.0 Brightness [cd/m2 ] ROCE = 270kΩ VOUT [Vp-p] ROCE = 180kΩ 20.0 15.0 160 ROCE = 220kΩ 140 ROCE = 180kΩ ROCE = 270kΩ 10.0 3.40 3.60 3.80 4.00 VDD [V] Figure 1. VDD VS. IDD 4.20 ROCE = 220kΩ 15.0 ROCE = 270kΩ 5.0 100 3.20 ROCE = 180kΩ 20.0 10.0 120 5.0 – 30.0 180 ROCE = 220kΩ Other component – 200 25.0 IDD [mA] 1SS403 NR4012T221M GRM3192C2A222JA01 3.20 3.40 3.60 3.80 4.00 VDD [V] Figure 2. VDD VS. VOUT 4.20 3.20 3.40 3.60 3.80 4.00 4.20 VDD [V] Figure 3. VDD VS. Brightness SEIKO NPC CORPORATION —12 SM8146AD1 Power supply from stabilizing supply ROCL OCL VSS OCE LDR DIM CHV ENA OUT1 VDD OUT2 ROCE VIH > 1.4V OFF ON C1 1.0µF L D OFF EL sheet 20cm2 VIH > 1.4V Ragulated voltage C2 D : TOSHIBA 1SS403 L : TAIYO YUDEN NR4012T221M C2 : Refer to the table below VDD [V] IDD [mA] 3.0 21.0 3.3 20.9 L [µH] ROCL [kΩ] ROCE [kΩ] fOUT [Hz] VOUT [V] Brightness [cd/m2] Other component 390 300 177 165 15.4 C2: GRM3192C2A222JA01 330 240 221 165 18.3 C2: GRM3192C2A222JA01 220 4.0 19.2 220 180 291 165 22.0 C2: GRM3192C2A222JA01 5.0 20.2 160 120 423 165 28.2 C2: GRM3192C2A472JA01 SEIKO NPC CORPORATION —13 SM8146AD1 EL Sheet: 30cm2 Direct power supply from Li-ion secondary battery ROCL OCL VSS OCE LDR DIM CHV ENA OUT1 VDD OUT2 ROCE VIH > 1.4V OFF ON C1 1.0µF L D OFF EL sheet 30cm2 VIH > 1.4V C2 Li-ion battery 3.2 to 4.2V D : TOSHIBA L : TAIYO YUDEN C2 : MURATA VDD [V] IDD [mA] 3.2 to 4.2 L [µH] Figure 1 220 ROCL [kΩ] 220 30.0 ROCE [kΩ] fOUT [Hz] 430 125 330 162 300 182 VOUT [V] Brightness [cd/m2] Figure 2 Figure 3 – 180 25.0 VOUT [Vp-p] 160 ROCE = 330kΩ 140 ROCE = 430kΩ ROCE = 330kΩ 10.0 ROCE = 300kΩ 120 5.0 Brightness [cd/m2 ] ROCE = 430kΩ 15.0 3.40 3.60 3.80 4.00 VDD [V] Figure 1. VDD VS. IDD 4.20 20.0 ROCE = 330kΩ ROCE = 300kΩ 15.0 10.0 ROCE = 430kΩ 5.0 100 3.20 – 30.0 ROCE = 300kΩ 20.0 Other component – 200 25.0 IDD [mA] 1SS403 NR4012T221M GRM3192C2A332JA01 3.20 3.40 3.60 3.80 4.00 VDD [V] Figure 2. VDD VS. VOUT 4.20 3.20 3.40 3.60 3.80 4.00 4.20 VDD [V] Figure 3. VDD VS. Brightness SEIKO NPC CORPORATION —14 SM8146AD1 Power supply from stabilizing supply ROCL OCL VSS OCE LDR DIM CHV ENA OUT1 VDD OUT2 ROCE VIH > 1.4V OFF ON C1 1.0µF L D OFF VIH > 1.4V Ragulated voltage EL sheet 30cm2 C2 D : TOSHIBA 1SS403 L : TAIYO YUDEN NR4012T221M C2 : Refer to the table below VDD [V] IDD [mA] 3.0 18.4 3.3 20.5 L [µH] ROCL [kΩ] ROCE [kΩ] fOUT [Hz] VOUT [V] Brightness [cd/m2] Other component 390 560 97 165 9.8 C2: GRM3192C2A222JA01 330 390 138 165 12.6 C2: GRM3192C2A222JA01 220 4.0 20.8 220 270 199 165 16.5 C2: GRM3192C2A472JA01 5.0 20.8 160 180 291 165 21.5 C2: GRM3192C2A472JA01 SEIKO NPC CORPORATION —15 SM8146AD1 PERIPHERAL COMPONENT SELECTION Coil Booster coil. Where possible, a closed-magnetic circuit type coil should be selected. If the coil inductance is less than 100µH, the switching cannot keep pace and the brightness cannot be increased. The coil flowing into the coil is a sawtooth waveform, and care should be taken to ensure the peak current does not exceed the maximum current rating. The coil DC resistive component causes power loss, so a coil with low DC resistive component is advantageous. The recommended inductance is 100 to 470µH. Table 2. Recommended parts list (Attention: ROCL and ROCE should be optimized per inductor.) Manufacture TAIYO YUDEN MURATA TDK TOKO Part number Dimensions [mm] Inductance [µH] W L T 1.2 NR4012T221M 220 4.0 4.0 NR3010T101M 100 3.0 3.0 1.0 LQH3NPN221NG0 220 3.0 3.0 1.0 LQH3NPN151NG0 150 3.0 3.0 1.0 LQH3NPN101NG0 100 3.0 3.0 1.0 LQH32CN221 220 3.2 2.5 2.0 VLS3012T-101MR23 100 3.0 3.0 1.2 1156AS-221M 220 2.85 2.8 1.0 1156AS-151M 150 2.85 2.8 1.0 1156AS-101M 100 2.85 2.8 1.0 888FU-221M 220 3.5 3.5 1.7 Diode Rectifier diode. This diode rectifies the high voltage generated by the coil. The peak reverse voltage exceeds 100V, hence a fast recovery type diode is recommended. Table 3. Recommended parts list Manufacture TOSHIBA ROHM Part number Dimensions [mm] W L T 1SS403 1.7 1.25 0.9 RF051VA2S 1.9 1.3 0.6 RF071M2S 2.6 1.6 0.8 High-voltage capacitor Smoothing capacitor. This capacitor smooths the high voltage generated by the coil and rectified by the diode. A withstand voltage rating of ≥ 100V should be selected. Generally, a high-dielectric ceramic capacitor will generate audible noises. The capacitors below are recommended. The recommended value is 0.0022 to 0.0033µF (100V). Table 4. Recommended parts list Manufacture Part number Capacitance [µF] Dimensions [mm] W L T MURATA GRM3192C2A222JA01 0.0022 3.2 1.6 0.85 TDK C2012CH2A222 0.0022 2.0 1.25 0.85 Panasonic ECWU1222JX5 0.0022 3.2 1.6 1.1 ELECTROSTATIC BREAKDOWN PROTECTIVE MEASURES (ESD) Electrostatic breakdown protective measures are required because the keypad comes into direct contact with the human body. The EL sheet surface is coated with an insulating film, but if the electrodes on the EL sheet periphery are exposed, static electricity can flow from these electrodes into the IC and lead to electrostatic breakdown. Accordingly, the EL sheet should be designed so that the electrodes are not exposed, or otherwise covered using insulating tape to provide a similar level of protection. SEIKO NPC CORPORATION —16 SM8146AD1 EVALUATION BOARD PATTERN Pattern (Top view) Silk + Resist (Top view) Pattern (Bottom view) SEIKO NPC CORPORATION —17 SM8146AD1 PACKAGE DIMENSIONS (Unit: mm) BOTTOM VIEW 6 6 1.8 ± 0.05 2.85 ± 0.05 10 10 2.4 ± 0.05 0.3 ± 0.05 TOP VIEW C0 1 .05 1 0.3 ± 0.05 5 5 3.1 ± 0.05 0.05 M 0.4MAX 0.65 0.05 FOOTPRINT 0.40 1.15 1.60 1.60 2.25 2.35 3.25 3.15 Foot pattern 3.30 0.90 1.15 0.35 0.65 0.65 3.30 0.35 0.50 Metal mask pattern SEIKO NPC CORPORATION —18 SM8146AD1 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: [email protected] NC0616BE 2007.09 SEIKO NPC CORPORATION —19