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
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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 30cm
2
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
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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
V
IC
V
BOOST
EL 1
EL 2
VDD
LDR
CHV
OUT1
OUTCOM
OUT2
High Voltage Switching Circuit
Divider
Divider
Oscillator
Control logic
Oscillator
OCL1
OCL2
R
OCL1
OCL3
R
OCL2
R
OCL3
ENA1
ENA2
OCE
R
OCE
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
V
DD
V
IN
V
CHV
Output voltage
V
LDR
V
OUT1/2/COM
Pow er dissipation
Storage temperature range
P
D
T
STG
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
V
DD2
T
O P R
Including coil current, V
D D
=
3.0V, T
a
≤
70
°C
Operating current
1
I
D 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
L
LDR
f
L 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
V
DD
= 3.0 V, T
a
= 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 time
1
Operating current
Stand-by current
1.
Symbol
V
DD
V
CHV
V
OUTH
V
OUTL
R
LDR
f
O C E 1
f
O C E 2
f
O C L 1
f
O C L 2
f
O U T 1
f
O U T 2
f
L D R 1
f
L D R 2
V
ENAH
V
ENAL
I
E N A H
t
E N A
I
D D 1
I
S 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 kΩ
R
O C E
= 180 kΩ
R
O C L
= 180 kΩ
I
L D R
= 50 mA
R
O C E
= 180 kΩ
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
kHz
384
V
D D
+ 0.3
V
S S
+ 0.5
6.0
100
1.0
1.0
µA
ms
mA
µA
V
V
V
V
V
Ω
Unit
ENA
V
SS
V
DD
−
0.5
V
SS
+ 0.5
V
DD
t
ENA
NIPPON PRECISION CIRCUITS—4
SM8145A
FUNCTIONAL DESCRIPTION
DISPLAY MODES
ENA input
Operation mode
ENA1
Standby
EL1
EL2
EL1 + EL2
L
H
L
H
ENA2
L
L
H
H
OUTCOM
L
Active
Active
Active
OUT1
L
Active
Hi-Z
Active
OUT2
L
Hi-Z
Active
Active
ROCL
–
R
OCL1
R
OCL2
R
OCL3
OUTPUT status
Brightness adjust
Notes) The internal oscillator resistance is selected in response to the state of the ENA pins.
The oscillator resistance (R
O C E 1 / 2 / 3
) adjust the luminance in each display mode, respectively.
OUT1
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HI-Z
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HI-Z
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max 100V
0-P
0V
max 100V
0-P
0V
max 100V
0-P
0V
OUTCOM
OUT2
EL 1
OFF(0V)
max 200V
P-P
EL 2
OFF(0V)
max 200V
P-P
ENA1 = LOW
ENA2 = LOW
ENA1 = HIGH
ENA2 = LOW
ENA1 = HIGH
ENA2 = HIGH
ENA1 = LOW
ENA2 = HIGH
NIPPON PRECISION CIRCUITS—5
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