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BU9798GUW Datasheet, PDF (2/5 Pages) Rohm – Silicon monolithic integrated circuits | |||
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âBlock diagrams
VLCD
VSS2
COM0â¦â¦CO M3 SEG0 â¦â¦â¦â¦â¦â¦â¦â¦â¦â¦â¦â¦ SEG48
LCD voltage
Generator
Ref Voltage
Circuit
Vreg
LCD
BIAS
SELECTOR
common
driver
Segment Seg ment Segment
driver driver/GPO driver/LED
GPO/LED
Contr ol ler
common blink ti ming
counter generator
DDRAM
GPO data latch
PW M
Generator
INHb
CLKIN
VDD
VSS
VSS
OSCILLATOR
Power On Reset
Command register
Data Decoder
seri al inter face
IF FILTER
CSB
SD
SCL
Output
Controller
PWMOUT
âOutline drawing
BU9798
Lot No.
2/4
â Electrical Characteristics
( Ta=-30~75degree, VDD=1.8V~3.6V, VLCD=3.3V~5.5V, VSS=0 ; unless otherwise specified )
Parameter
Symbol
Limit
Unit
MIN
TYP MAX
Condition
âHâ level input voltage VIH
âLâ level input voltage
VIL
0.8VDD
VSS
-
VDD
V SD, SCL, CSB, CLKIN, TEST1, INHb
- 0.2VDD V SD, SCL, CSB, CLKIN, TEST1, INHb
Hysteresis width
VH
-
0.2
-
V SCL, INHb, VDD=3.3V, Ta=25degree
âHâ level input current
IIH1
-
-
5
uA SD, SCL, CSB, CLKIN, INHb, VI=3.6V
âLâ level input current
IIL1
-5
-
-
uA SD, SCL, CSB, CLKIN, INHb, TEST1, VI=0V
VOH1 VLCD-0.4 -
-
V
Iload=-50uA, VLCD=5.0V, SEG0~48,
In case, internal regulator do not use
âHâ level output
voltage (ï¼1)
(ï¼3)
VOH2 VLCD-0.4 -
VOH3 VLCD-0.6 -
-
V
Iload=-50uA, VLCD=5.0V, COM0~3,
IN case, internal regulator do not use
-
V
Iload=-1mA,VLCD=5.0V,SEG15~45(GPO mode)
In case, internal regulator do not use
VOH4 VDD-0.6
-
-
V Iload=-1mA, VDD=3.3V, PWMOUT
VOL1
-
-
0.4
V Iload= 50uA, VLCD=5.0V, SEG0~48
VOL2
-
-
0.4
V Iload= 50uA, VLCD=5.0V, COM0~3
âLâ level output
voltage (ï¼3)
VOL3
-
-
0.5
V
Iload=1mA, VLCD=5.0V, VDD=3.3V
SEG15~45(GPO modeï¼, PWMOUT
VOL4
-
0.11
0.5
V
Iload=20mA, VLCD=5.0V
SEG46~48ï¼LED drive modeï¼
IstVDD
-
3
10
uA Input terminal ALLâLâ, Display off, Oscillation off
IstVLCD
-
0.5
5
uA Input terminal ALLâLâ, Display off, Oscillation off
IVDD1
-
IVDD2
-
Supply current (ï¼2) IVLCD1
-
IVLCD2
-
8
15
uA
VDD=3.3V, Ta=25degree, 1/3bias, fFR=64Hz,
PWM generate off, All output pin open
90
130
uA
VDD=3.3V, Ta=25degree, 1/3bias, fFR=64Hz,
PWM Frequency=500Hz setting, output pin open
VLCD=5.0V, Ta=25degree, 1/3biasãfFR=64Hz,
10
15
uA internal regulator do not use, LED drive mode off, All output
pin open
VLCD=5.0V, Ta=25degree, 1/3bias, fFR=64Hz,
25
40
uA using internal regulator , LED drive mode off, All output pin
open
VLCD=5.0V, Ta=25degree, 1/3bias,
IVLCD3
-
30
48
uA fFR=64Hz, using internal regulator,
PWM Frequency=500Hz setting, output pin open
*1 In case, internal regulator do not use. When you use internal regulator, please add load regulation specified at page3
*2 In case, power save mode 1 and frame inversion setting *3 Iload : In case, load current from only one port
REV. B
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