Document
SM8145A
NIPPON PRECISION CIRCUITS INC.
Dual EL Driver
OVERVIEW
The SM8145A is an Electro Luminescent (EL) driver IC that can drive two EL displays simultaneously. Each EL display mode ON/OFF function can be separately controlled using two enable (ENA) pins. The luminance in each display mode can be adjusted, enabling the luminance and consumption current to be optimized to match the application. The device is supplied in ultra-small leadless QFN-20 packages, making driver circuit miniaturization possible.
FEATURES
I I I
PINOUT
(Top view)
I
I I I I I
2 separate EL display drivers 2-display simultaneous driver operation Adjustable luminance and current consumption in each mode 3 display modes and a standby mode select control pins (ENA1, ENA2) 1 to 30cm2 EL display size per channel 1.6 to 5.5V supply voltage 200 Vp-p maximum EL driver voltage 20-pin QFN ultra-small leadless package High voltage CMOS Process
15 14 13 12 11
OUTCOM N.C. OUT1 N.C. CHV
OUT2 N.C. VDD N.C. ENA1
16 17 18 19 20
8145A
1 2 3 4 5
10 9 8 7 6
ENA2 OCE OCL3 N.C. OCL2
APPLICATIONS
I I I
Mobile phone PDA, Handheld PC Illumination accessory
ORDERING INFORMATION
D e vice SM8145AB P ackag e 20-pin QFN
PACKAGE DIMENSIONS
(Unit : mm)
Weight : 0.037g
4.20 ± 0.20 4.00 ± 0.10
15 16 11 10
4.20 ± 0.20
4.00 ± 0.10
20
6 1 0.50 5
LDR N.C. VSS N.C. OCL1
0.60 ± 0.10 + 0.03 0.02 − 0.02
0.05
0.22 ± 0.05
0.05 M
NIPPON PRECISION CIRCUITS—1
1.00max
0.22
SM8145A
BLOCK DIAGRAM
VIC VBOOST EL 1 EL 2
VDD
LDR
CHV
OUT1
OUTCOM
OUT2
High Voltage Switching Circuit
Divider
Divider
Oscillator
Control logic
Oscillator
OCL1
OCL2 ROCL1
OCL3 ROCL2 ROCL3 ENA1 ENA2
OCE ROCE
VSS
PIN DESCRIPTION
Pin nu m b e r 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Name LDR N . C. VSS N . C. OCL1 OCL2 N . C. OCL3 OCE ENA2 ENA1 N . C. VDD N . C. OUT2 OUTCOM N . C. OUT1 N . C. CHV I/O O – – – I I – I I Ip 1 Ip 1 – – – O O – O – I Booster coil driver output No connection (must be open) Ground No connection (must be open) Coil driver oscillator 1 (oscillator frequency determined by external resistor) Coil driver oscillator 2 (oscillator frequency determined by external resistor) No connection (must be open) Coil driver oscillator 3 (oscillator frequency determined by external resistor) EL driver oscillator (oscillator frequency determined by external resistor) E n a ble input 2 (HIGH: enable, LOW : disable) E n a ble input 1 (HIGH: enable, LOW : disable) No connection (must be open) Supply No connection (must be open) Output 2 Output (common) No connection (must be open) Output 1 No connection (must be open) High-voltage DC input Function
1. Built-in pull-down resistor.
NIPPON PRECISION CIRCUITS—2
SM8145A
SPECIFICATIONS
Absolute Maximum Ratings
P arameter Supply voltage range Input voltage range Symbol VDD V IN VCHV Output voltage VLDR VOUT1/2/COM Pow er dissipation Storage temperature range PD TSTG All Input pins CHV pin LDR pin OUT1, OUT2, OUTCOM pin T a ≤ 70 °C T a ≤ 85 °C Condition Rating − 0.3 to 7.0 V S S − 0.3 to V D D + 0.3 0.5 to 120 0.5 to 120 0.5 to 120 140 100 − 55 to 125 Unit V V V V V mW mW °C
Recommended Operating Conditions
Rating P arameter Supply voltage range Operating temperature Symbol VDD2 TO P R Including coil current, V D D = 3.0V, T a ≤ 70 °C Operating current 1 ID D 2 Including coil current, V D D = 5.0V, T a ≤ 70 °C Including coil current, V D D = 3.0V, T a ≤ 85 °C Including coil current, V D D = 5.0V, T a ≤ 85 °C Coil inductance LLDR fL D R = 64 kHz Condition min 1.6 − 40 – – – – – typ 3.0 – – – – – 0.47 max 5.5 85 85 51 60 36 – V °C mA mA mA mA mH Unit
1. Max value is as same as Absolute Maximum Ratings.
NIPPON PRECISION CIRCUITS—3
SM8145A
DC Characteristics
VDD = 3.0 V, Ta = 25 °C unless otherwise noted.
Rating P arameter Supply voltage CHV output voltage O U T 1 , O U T 2 , O U T C O M H I G H - l evel output voltage O U T 1 , O U T 2 , O U T C O M L OW -level output voltage LDR output resistance OCE oscillator frequency OCE oscillator frequency range OCL1, OCL2, OCL3 oscillator frequency OCL1, OCL2, OCL3 oscillator frequency range OUT1, OUT2, OUTCOM output frequency OUT1, OUT2, OUTCOM output frequency range LDR inductance driver frequency LDR inductance driver frequency range ENA1, ENA2 HIGH-level input voltage E N A 1 , E N A 2 L OW -level input voltage ENA1, ENA2 input current ENA1, ENA2 r ise Operating current Stand-by current 1. time 1 Symbol VDD VCHV VOUTH VOUTL R LDR fO C E 1 fO C E 2 fO C L 1 fO C L 2 fO U T 1 fO U T 2 fL D R 1 fL D R 2 VENAH VENAL IE N A H tE N A ID D 1 IS T B Excluding coil current E N A = L OW ENA = HIGH, V D D = 1.6 to 5.5V E N A = L OW , V D D = 1.6 to 5.5V V E N A H = V D D = 3.0V R O C L = 180 k Ω R O C E = 180 k Ω R O C L = 180 k Ω IL D R = 50 mA R O C E = 180 k Ω Condition min 1.6 0.5 – – – 205 32 205 32 200 31 51 8 V D D – 0.5 V S S – 0.3 2.0 – – – typ 3.0 – – – 8.0 256 – 256 – 250 – 64 – – – 4.0 – – – max 5.5 100 100 0.5 12.0 307 kHz 1536 307 kHz 1536 300 Hz 1500 77 .