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PDF BU9796A Data sheet ( Hoja de datos )
| Número de pieza | BU9796A | |
| Descripción | Standard LCD Segment Driver | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Datasheet
Standard LCD Segment Driver
BU9796Axxx Series MAX 80 segments (SEG20×COM4)
●Features
Integrated RAM for display data (DDRAM):
20 x 4 bit (Max 80 Segment)
LCD drive output :
4 Common output, Max 20 Segment 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:
BU9796AFS
80 Segments
BU9796AMUV
48 Segments
Display Duty:
1/4
■ Bias:
1/2, 1/3 selectable
■ Interface:
2wire serial interface
●Package
W (Typ.) x D (Typ.) x H (Max.)
VQFN024V4040
4.00mm x 4.00mm x 1.00mm
SSOP-A32
13.60mm x 7.80mm x 2.01mm
●Typical Application Circuit
BU9796AFS
VDD
VDD
VLCD
Controller
SDA
SCL
OSCIN
TEST1
TEST2
VSS
COM0
COM1
COM2
COM3
SEG0
SEG1
SEG19
Segment
LCD
Using internal oscillator
Figure 1. Typical application circuit
○Product structure：Silicon monolithic integrated circuit
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111･14･001
○This product is not designed protection against radioactive rays.
1/28
TSZ02201-0A2A0D300100-1-2
31.Aug.2012 Rev.001
Free Datasheet http://www.datasheet4u.com/
1 page  
BU9796Axxx Series MAX 80 segments (SEG20×COM4)
Datasheet
●Electrical Characteristics - continued
MPU interface Characteristics (VDD=2.5V to 5.5V, VLCD=0V, VSS=0V, Ta=-40℃ to 85℃, unless otherwise specified)
Parameter
Limits
Symbol
Unit
MIN TYP MAX
Conditions
Input rise time
tr - - 0.3 µs
Input fall time
tf - - 0.3 µs
SCL cycle time
tSCYC 2.5
-
- µs
“H” SCL pulse width
tSHW
0.6
-
- µs
“L” SCL pulse width
tSLW
1.3
-
- µs
SDA setup time
tSDS
100
-
- µs
SDA hold time
tSDH
100
-
- us
Buss free time
tBUF
1.3
-
- µs
START condition hold time tHD;STA 0.6
-
- µs
START condition setup time tSU;STA 0.6
-
- µs
STOP condition setup time tSU;STO 0.6
-
- µs
SDA
SCL
SDA
●I/O equivalent circuit
VDD
VLCD
VSS
SDA
tBUF
tS LW
tf
tSCYC
tHD; STA tr
tSDH tS HW tSDS
tSU; STA
Figure6. Interface Timing
VDD
VSS
SCL
tSU; STO
VSS
VSS
VDD
TEST1
VSS
VDD
TEST2
VSS
VDD
OSCIN
VSS
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111･15･001
VDD
SEG/COM
VSS
Figure7. I/O equivalent circuit
5/28
TSZ02201-0A2A0D300100-1-2
31.Aug.2012 Rev.001
Free Datasheet http://www.datasheet4u.com/
5 Page 
BU9796Axxx Series MAX 80 segments (SEG20×COM4)
Datasheet
○OSCILLATOR
The clock signals for logic and analog circuit can be generated from internal oscillator or external clock. If internal
oscillator circuit is used, OSCIN must be connected to VSS level.
*When using external clock mode, input external clock from OSCIN terminal after ICSET command setting.
OSCIN
BU9796A
VSS
OSCIN
BU9796A
VSS
Clock
Figure 13. Internal oscillator circuit mode
Figure 14. Ext clock input mode
○ LCD Driver Bias Circuit
This device generates LCD driving voltage with on-chip Buffer AMP.
And it can drive LCD at low power consumption.
*1/3 and 1/2Bias can set in MODESET command.
*Line and frame inversion can set in DISCTL command.
Refer to the “LCD driving waveform” about each LCD driving waveform.
○ Blink timing generator
This device has Blink function.
* This device will be Blink mode with BLKCTL command.
Blink frequency varies widely by characteristic of fCLK, when internal oscillation circuit.
About the characteristics of fCLK, refer to Oscillation Characteristics.
○ Reset initialize condition
Initial condition after execute Software Reset is as follows.
・Display is OFF.
・DDRAM address is initialized (DDRAM Data is not initialized).
Refer to Command Description about initialize value of register.
●Command / Function List
Description List of Command / Function
No. Command
1 Display Control (DISCTL)
2 Mode Set (MODESET)
3 Address Set (ADSET)
4 Set IC Operation (ICSET)
5 Blink Control (BLKCTL)
6 All Pixel Control (APCTL)
Function
Set LCD display mode 1
Set LCD drive mode
Set LCD display mode 2
Set IC operation
Set blink mode
Set pixel condition
www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111･15･001
11/28
TSZ02201-0A2A0D300100-1-2
31.Aug.2012 Rev.001
Free Datasheet http://www.datasheet4u.com/
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet BU9796A.PDF ] | |
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