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PDF BU91501KV-M Data sheet ( Hoja de datos )
| Número de pieza | BU91501KV-M | |
| Descripción | Multi- function LCD Segment Drivers | |
| Fabricantes | ROHM Semiconductor | |
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Datasheet
LCD Segment Drivers
Multi- function LCD Segment Drivers
BU91501KV-M
MAX 204 Segment(51SEGx4COM)
General Description
The BU91501KV-M is 1/4 or 1/3-Duty general-purpose
LCD driver that can be used for frequency display in
electronic tuners under the control of a microcontroller.
The BU91501KV-M can drive up to 204 LCD
Segments directly and control up to 4 general-purpose
output ports and up to 30 key input detection.
Features
AEC-Q100 Qualified (Note)
Key input function for up to 30 keys (A key scan is
performed only when a key is pressed.)
Either 1/4 or 1/3 duty can be selected
1/4 duty drive：Up to 204 segments
1/3 duty drive：Up to 156 segments
Integrated RAM for display data (DDRAM)
Segment/GPO (Max 4port) output mode selectable
Support standby mode
Integrated Power-on Reset circuit
Integrated Oscillator circuit
No external component
Low power consumption design
(Note) Grade 2
Applications
Car Audio, Home Electrical Appliance,
Meter Equipment etc.
Key Specifications
■ Supply Voltage Range:
2.7V to 6.0V
■ LCD drive power supply Range:
4.5V to 6.0V
■ Operating Temperature Range: -40°C to +105°C
■ Max Segments:
204 Segments
■ Display Duty:
1/3, 1/4 selectable
■ Bias:
1/2, 1/3 selectable
■ Interface:
3wire serial interface
Package
W (Typ.) x D (Typ.) x H (Max.)
VQFP64
12.00mm x 12.00mm x 1.60mm
Typical Application Circuit
Key Matrix
+5V
(Note1)
+5.5V
(Note1)
From
Controller
To Controller
KS1/S42
|
KS6/S47
VDD
KI1/S48
|
KI5/S52
VLCD
COM1
COM2
COM3
P1/S1
P2/S2
P4/S4
S5
RESB
CSB
SCL
SD
DO
S40
COM4/S41
(P1)
(P2) (General purpose ports)
(For use control of backlight)
(P4)
LCD Panel
(Up to 204
Segments)
(Note1) Insert capacitors between VDD/VLCD and VSS C≥0.1uF.
Figure 1. Typical Application Circuit
○Product structure：Silicon monolithic integrated circuit
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111･14･001
○This product is not designed protection against radioactive rays.
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BU91501KV-M
I/O equivalent circuit
３
Datasheet
Figure 6. I/O equivalent circuit
Function descriptions
Command and Data Transfer Method
3-SPI (3-wire Serial Interface)
This device is controlled by a 3-wire signal (CSB, SCL, and SD).
First, Interface counter is initialized with CSB=“H"
Setting CSB=”L” enables SD and SCL inputs.
First, Interface counter is initialized with CSB=“H", and then CSB=”L” makes SD and SCL input enable.
The protocol of 3-SPI transfer is shown as follows.
Each command starts with D7 bit as MSB data, followed by D6 to D0 (this is while CSB =”L”).
(Internal data is latched at the rising edge of SCL, then the data is converted to an 8-bit parallel data at the falling edge of
the 8th CLK.)
When you rise CSB = “H”, in case command less than 8bit, command and data are canceled.
(1) Write Mode
Figure 7. 3-SPI Data Transfer Format
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111･15･001
5/30
TSZ02201-0P4P0D301120-1-2
8.July.2015 Rev.001
5 Page 
BU91501KV-M
Datasheet
Key Scan Operation
Key Scan Timing
The key scan period is 288T(s). To reliably determine the on/off state of the keys, the BU91501KV-M scans the keys
twice and determines that a key has been pressed when the key data agrees. It outputs a key data read request (a low
level on DO) 610T(s) after starting a key scan. If the key data does not agree and a key is pressed at that point, it scans
the keys again. Thus, BU91501KV-M cannot detect a key press shorter than 610T(s).
KS1 * 1
1
KS2 *
2
2
KS3 *
3
3
KS4 *
4
4
KS5 *
5
5
KS6 6 6
579261T6T[S[S]]
T=
1
fosc
Figure 10. Key Scan Timing
*
*
*
*
*
Normal Mode
KS1/S42 - KS6/S47 pins are set high.
When a key is pressed, a key scan is started and the keys are scanned until all keys are released. Multiple key presses
are recognized by determining whether multiple key data bits are set.
If a key is pressed for longer than 610 T(s) (Where T=1/fosc (When External clock input, fosc is a quarter of external
clock)), the BU91501KV-M outputs a key data read request (a low level on DO) to the controller. The controller
acknowledges this request and reads the key data. However, if CSB is ”L” during a serial data transfer, DO will be set
high.
After the controller reads the key data, the key data read request is cleared (DO is set high) and BU91501KV-M performs
another key scan. Also note that DO can be controlled to be an open-drain output or a CMOS output. If set to be an
open-drain output, a pull-up resistor (between 1 and 10KΩ) is required.
Key Input 1
Key Input 2
Key Scan
610T[s]
CSB
Serial data transfer
Serial data transfer
SD
610T[s]
610T[s]
Key RD
Serial data transfer
Command (85H)
Key RD
Command (85H)
Key RD
Command (85H)
DO
Key data read
Key data read
Key data read
Key data read request
Key data read request
Key data read request
T
1
fosc
External Clock Input
： T
1
fosc
/
4
Figure 11. Key scan operation in normal mode
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111･15･001
11/30
TSZ02201-0P4P0D301120-1-2
8.July.2015 Rev.001
11 Page | ||
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