Datasheet SM8145AB Datasheet (NPC)

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

■

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

■

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

■

2

EL display size per channel

APPLICATIONS

■

Mobile phone

■

PDA, Handheld PC

■

Illumination accessory

PINOUT

(Top view)

OUTCOM

N.C.

OUT1

N.C.

CHV

OUT2

15 14 13 12 11

16

17

18

8145A

19
20

12345

LDR

N.C.

N.C.

VDD

N.C.

VSS

N.C.

ENA1

10

9

8
7
6

OCL1

ENA2
OCE
OCL3
N.C.
OCL2

ORDERING INFORMATION

De vice Pack ag e

SM8145AB 20-pin QFN

PACKAGE DIMENSIONS

(Unit : mm)

Weight : 0.037g

4.20 ± 0.20

4.00 ± 0.10

1115

16

4.00 ± 0.10

4.20 ± 0.20

20

15

0.50

0.22 ± 0.05

10

6

+ 0.03

0.05

M

0.05

NIPPON PRECISION CIRCUITS—1

0.02 − 0.02

0.60 ± 0.10

0.22

1.00max

BLOCK DIAGRAM

SM8145A

V

IC VBOOST

PIN DESCRIPTION

VDD CHVLDR

Divider

Oscillator

OCL2OCL1 OCL3

ROCL2ROCL1 ROCL3

EL 1

OUT1

High Voltage Switching Circuit

Control logic

ENA1

ENA2

EL 2

OUTCOM

Divider

Oscillator

OCE

OUT2

R

OCE

VSS

Pin number Name I / O Function

1 L D R O Booster coil driver output
2 N. C. – No connection (must be open)
3 VSS – Ground
4 N. C. – No connection (must be open)
5 OCL1 I Coil driver oscillator 1 (oscillator frequency determined by external resistor)
6 OCL2 I Coil driver oscillator 2 (oscillator frequency determined by external resistor)
7 N. C. – No connection (must be open)
8 OCL3 I Coil driver oscillator 3 (oscillator frequency determined by external resistor)

9 O CE I EL d river oscillator (oscillator frequency determined by exter nal resistor)
10 ENA2 Ip
11 ENA1 Ip

1

Enable input 2 (HIGH: enable, LOW : disable)

1

Enable input 1 (HIGH: enable, LOW : disable)
12 N.C. – No connection (must be open)
13 V D D – Supply
14 N.C. – No connection (must be open)
15 OU T 2 O Output 2
16 O U T C O M O Output (common)
17 N.C. – No connection (must be open)
18 OU T 1 O Output 1
19 N.C. – No connection (must be open)
20 CHV I High-voltage DC input

1. Built-in pull-down resistor.

NIPPON PRECISION CIRCUITS—2

C

SM8145A

SPECIFICATIONS

Absolute Maximum Ratings

Parameter Sym bol Condition Rating Unit

Supply voltage range V
Input voltage range V

V

Output voltage

V

V

OUT1/2/COM

Po w er dissipation P

Storage temperature range T

DD

IN

CHV

LDR

D

STG

All Input pins V
CHV pin 0.5 to 120 V
LDR pin 0.5 to 120 V
OUT1, OUT2, OUTCOM pin 0.5 to 120 V
T

≤

70

°

C 140 m W

a

T

≤

85

°

C 100 m W

a

−

0.3 to 7.0 V

−

SS

0.3 to V

−

+ 0.3 V

DD

55 to 125

°

Recommended Operating Conditions

Parameter Sym bol Condition

Supply voltage range V
Ope rating temperature T

Op e rating current

1

Coil inductance L

1. Max value is as same as Absolute Maximum Ratings.

DD2

OPR

I

DD2

LDR

Including coil current, V
Including coil current, V
Including coil current, V
Including coil current, V
f

= 64 kHz – 0.47 – m H

LDR

DD

DD

DD

DD

=

3.0V, T

=

5.0V, T

=

3.0V, T

=

5.0V, T

Rating

min typ max

1.6 3.0 5.5 V

−

40 – 85

≤

70

°

C– – 85 mA

a

≤

70

°

C– – 51 mA

a

≤

85

°

C– – 60 mA

a

≤

85

°

C– – 36 mA

a

Unit

°

C

NIPPON PRECISION CIRCUITS—3

DC Characteristics

V

= 3.0 V, T

DD

= 25 ° C unless otherwise noted.

a

SM8145A

Parameter Sym bol Condition

Supply voltage V
CHV output voltage V
OUT1, OUT2, OUTCOM HIGH-level

output voltage
OUT1, OUT2, OUTCOM LOW-level

output voltage
LDR output resistance R
OCE oscillator frequency f
OCE oscillator frequency range f
OCL1, OCL2, OCL3 oscillator frequency f
OCL1, OCL2, OCL3 oscillator frequency

range
OUT1, OUT2, OUTCOM output

frequency
OUT1, OUT2, OUTCOM output

frequency range
LDR inductance driver frequency f
LDR inductance driver frequency range f
ENA1, ENA2 HIGH-level input voltage V
ENA1, ENA2 LOW-level input voltage V
ENA1, ENA2 input current I
ENA1, ENA2 rise time

1

Op e rating current I
Stand-by current I

1.

VDD

SS + 0.5

V

VDD − 0.5

ENA

VSS

CHV

V

OUTH

V

OUTL

LDR

OCE1

OCE2

OCL1

f

OCL2

f

OUT1

f

OUT2

LDR1

LDR2

ENAH

ENAL

ENAH

t

ENA

DD1

STB

Rating

min typ ma x

DD

1.6 3.0 5.5 V

0.5 – 100 V

– – 100 V

– – 0.5 V

I

= 50 mA – 8.0 12.0

LDR

R

= 180 k

OCE

Ω

205 256 307

32 – 1536

R

= 180 k

OCL

Ω

205 256 307

32 – 1536

R

= 180 k

OCE

Ω

200 250 300

31 – 1500

R

= 180 k

OCL

Ω

51 64 77

8 – 384
ENA = HIGH, V
ENA = LOW, V
V

= V

ENAH

= 1.6 to 5.5V V

DD

= 1.6 to 5.5V V

DD

= 3.0V 2.0 4.0 6.0

DD

– 0.5 – V

DD

– 0.3 – V

SS

– – 100 ms
Excluding coil current – – 1.0 mA
ENA = LOW – – 1.0

DD

SS

+ 0.3
+ 0.5

Unit

Ω

kHz

kHz

Hz

kHz

V

µ

A

µ

A

tENA

NIPPON PRECISION CIRCUITS—4

FUNCTIONAL DESCRIPTION

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DISPLAY MODES

SM8145A

Operation mode

ENA input OUTPUT status Brightness adjust

ENA1 ENA2 O UTCOM OUT1 OUT2 ROCL

Standby LLLLL–

EL 1 H L Active Active Hi-Z R
EL 2 L H Active Hi-Z Active R

EL1 + EL2 H H Active Active Active R

OCL1

OCL2

OCL3

Notes) The internal oscillator resistance is selected in response to the state of the ENA pins.

The oscillator resistance (R

OUT1

OUTCOM

OUT2

EL 1

EL 2

) adjust the luminance in each display mode, respectively.

OCE1/2/3

;;;;;;;;;;;;;;;;;

;;;;;;;;;;;;;;;;;

;;;;;;;;;;;;;;;;;

HI-Z

OFF(0V)

;;;;;;;;;;;;;;;;

HI-Z

;;;;;;;;;;;;;;;;

OFF(0V)

max 100V

0V
max 100V

0V
max 100V

0V

max 200V

max 200VP-P

0-P

0-P

0-P

P-P

ENA1 = LOW
ENA2 = LOW

ENA1 = HIGH
ENA2 = LOW

ENA1 = HIGH
ENA2 = HIGH

ENA1 = LOW
ENA2 = HIGH

NIPPON PRECISION CIRCUITS—5

TYPICAL APPLICATIONS

■

EL size: 20 + 20cm

2

, Current consumption: 20 + 20mA

0.1µF
100V

0.01µF

470µH

3.0V

180kΩ

180kΩ

360kΩ

SM8145A

CHV

LDR

OUTCOM

VSS

OCL1

OCL2

OCL3

OUT1

OUT2

VDD

ENA1

ENA2

OCE

180kΩ

EL 20cm

EL 20cm

2

2

■

EL size: 20 + 30cm

■

EL size: 10 + 30cm

Diode: TOSHIBA 1SS250
Coil: MURATA LQH4N471K04M00

2

, Current consumption: 20 + 30mA

0.1µF
100V

CHV

LDR

VSS

OCL1

OCL2

OCL3

0.01µF

470µH

3.0V

180kΩ

270kΩ

430kΩ

Diode: TOSHIBA 1SS250
Coil: MURATA LQH4N471K04M00

2

, Current consumption: 10 + 30mA

OUT1

OUTCOM

OUT2

VDD

ENA1

ENA2

OCE

180kΩ

1kΩ

EL 20cm

EL 30cm

2

2

0.1µF
100V

0.01µF

470µH

3.0V

91kΩ

270kΩ

360kΩ

CHV

LDR

VSS

OCL1

OCL2

OCL3

OUT1

OUTCOM

OUT2

VDD

ENA1

ENA2

OCE

180kΩ

1kΩ

EL 10cm

EL 30cm

2

2

Diode: TOSHIBA 1SS250
Coil: MURATA LQH4N471K04M00

Note: Connect a 1k

Ω

resistor to protect IC when the EL is over 20cm

2

per channel.

Note: Do not operate the SM8145A with the EL NOT connected (no load to OUTCOM/OUT1/OUT2) since the IC will be damaged.

NIPPON PRECISION CIRCUITS—6

SM8145A

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 expor t, directly or
indirectly, any products without first obtaining required licenses and approvals from appropriate government agencies.

NIPPON PRECISION CIRCUITS INC.
4-3, Fukuzumi 2-chome

Koto-ku, To kyo 135-8430, Japan
Telephone: [phone]

NIPPON PRECISION CIRCUITS INC.

Facsimile: [phone]
http://www.npc.co.jp/
Email: sales

npc.co.jp

@

NC0001AE 2000.10

NIPPON PRECISION CIRCUITS—7