Segment Drivers. BU9795AFV Datasheet

BU9795AFV Drivers. Datasheet pdf. Equivalent

BU9795AFV Datasheet
Recommendation BU9795AFV Datasheet
Part BU9795AFV
Description Standard LCD Segment Drivers
Feature BU9795AFV; Datasheet Standard LCD Segment Drivers BU9795AFV MAX 108 segments (SEG27×COM4) ●Features  Integr.
Manufacture ROHM
Datasheet
Download BU9795AFV Datasheet




ROHM BU9795AFV
Datasheet
Standard LCD Segment Drivers
BU9795AFV MAX 108 segments (SEG27×COM4)
Features
Integrated RAM for display data (DDRAM) :
27 × 4bit (Max 108 Segment)
LCD drive output :
4 Common output, Max 27Segment output
Integrated Buffer AMP for LCD driving
Integrated Oscillator circuit
No external components
Low power consumption design
●Applications
Telephone
FAX
Portable equipment (POS, ECR, PDA etc.)
DSC
DVC
Car audio
Home electrical appliance
Meter equipment
etc.
Key Specifications
Supply Voltage Range:
+2.5V to +5.5V
Operating Temperature Range: -40°C to +85°C
Max Segments:
108 Segments
Display Duty:
1/4
Bias:
1/2, 1/3 selectable
Interface:
3wire serial interface
Packages
W (Typ) x D (Typ) x H (Max)
SSOP-B40
13.60mm x 7.80mm x 2.00mm
●Typical Application Circuit
VDD
Controller
VDD
VLCD
INHb
CSB
SD
SCL
OSCIN
TEST
VSS
COM0
COM1
COM2
COM3
SEG4
SEG5
SEG30
Segment
LCD
Internal oscillator circuit mode
Figure 1. Typical application circuit
Product structureSilicon monolithic integrated circuit
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211114001
This product has no designed protection against radioactive rays.
1/26
TSZ02201-0A0A2D300020-1-2
20.Mar.2019 Rev.004



ROHM BU9795AFV
BU9795AFV MAX 108 segments (SEG27×COM4)
Block Diagrams / Pin Configurations / Pin Descriptions
COM0……COM3
SEG4……SEG30
VDD
LCD voltage generator
Common
driver
Segment
driver
VLCD
INHb
OSCIN
VSS
LCD BIAS
SELECTOR
Common Blink timing
counter generator
DDRAM
OSCILLATOR
Power On Reset
TEST
Command
Register
Command
Data Decoder
Serial interface
IF FILTER
CSB SD
SCL
40
1
21
20
Figure 2. Block Diagram
Figure 3. Pin Configuration (TOP VIEW)
Pin name
INHb
TEST
Pin No.
36
35
OSCIN
31
SD
SCL
CSB
VSS
VDD
VLCD
SEG4 to SEG30
COM0 to COM3
34
33
32
30
29
28
1 to 23,
37 to 40
24 to 27
Table 1 Pin Description
I/O Function
I
Input terminal for turn off display
H : turn on display L : turn off display
I
Test input (ROHM use only)
Must be connected to VSS
External clock input
I Ex clock and Int clock can be changed by command.
Must be connected to VSS when using internal oscillation circuit.
I Serial data input
I Serial data transfer clock
I Chip select : ”L” active
GND
Power supply
I Power supply for LCD driving
O SEGMENT output for LCD driving
O COMMON output for LCD driving
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
2/26
TSZ02201-0A0A2D300020-1-2
20.Mar.2019 Rev.004



ROHM BU9795AFV
BU9795AFV MAX 108 segments (SEG27×COM4)
●Absolute Maximum Ratings (VSS=0V)
Parameter
Symbol
Power supply voltage1
VDD
Ratings
-0.5 to +7.0
Unit
V Power supply
Remark
Power supply voltage2
Power dissipation
Input voltage range
VLCD
Pd
VIN
-0.5 to VDD
0.7
-0.5 to VDD+0.5
V LCD drive voltage
W
When use more than Ta=25°C, subtract 7mW
per degree (Package only)
V
Operational temperature range Topr
-40 to +85
°C
Storage temperature range
Tstg
-55 to +125
°C
Recommended Operating Ratings(Ta=-40°C to +85°C,VSS=0V)
Parameter
Symbol
Min.
Ratings
Typ.
Max.
Unit
Remark
Power Supply voltage1
VDD 2.5 - 5.5 V Power supply
Power Supply voltage2
VLCD
* Please use VDD-VLCD2.4V condition.
0
-
VDD
-2.4
V LCD drive voltage
Electrical Characteristics
DC Characteristics (VDD=2.5V to 5.5V, VSS=0V, Ta=-40°C to +85°C, unless otherwise specified)
Parameter
Symbol
MIN
Limits
TYP
Unit
MAX
Conditions
“H” level input voltage
VIH 0.7VDD
-
VDD V
“L” level input voltage
VIL VSS
- 0.3VDD V
“H” level input current
IIH -
- 1 µA
“L” level input current
LCD Driver
on resistance
SEG
COM
VLCD supply voltage
IIL
RON
RON
VLCD
-1
-
-
0
- - µA
3.5 - Iload=±10µA
3.5 -
- VDD -2.4 V VDD-VLCD2.5V
Standby current
Power consumption 1
Power consumption 2
Ist
IDD1
IDD2
-
-
-
-
12.5
20
5 µA Display off, Oscillator off
VDD=3.3V, Ta=25°C,
30 µA Power save mode1, FR=70Hz
1/3 bias, Frame inverse
VDD=3.3V, Ta=25°C,
40 µA Normal mode, FR=80Hz
1/3 bias, Line inverse
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ2211115001
3/26
TSZ02201-0A0A2D300020-1-2
20.Mar.2019 Rev.004







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