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15. LCD Driver
The TMP86PM29BUG has a driver and control circuit to directly drive the liquid crystal device (LCD). The pins
to be connected to LCD are as follows:
1. Segment output port 32 pins (SEG31 to SEG0)
2. Common output port4 pins (COM3 to COM0)
In addition, C0, C1, V1, V2, V3 pin are provided for the LCD driver's booster circuit.
The devices that can be directly driven is selectable from LCD of the following drive methods:
1. 1/4 Duty (1/3 Bias) LCD Max 128 Segments(8 segments × 16 digits)
2. 1/3 Duty (1/3 Bias) LCD Max 96 Segments(8 segments × 12 digits)
3. 1/2 Duty (1/2 Bias) LCD Max 64 Segments(8 segments × 8 digits)
4. Static LCD
15.1 Configuration
LCDCR
7
6
EDSP
BRES
13
5
fc/2
, fs/2
11
3
fc/2
, fs/2
10
2
fc/2
, fs/2
9
fc/2
Constant voltage
booster circuit
C0 C1
V1
V2 V3
Note: The LCD driver incorporates a dedicated divider circuit. Therefore, the break function of a debugger (development
tool) will not stop LCD driver output.
Max 32 Segments(8 segments × 4 digits)
5
4
3
2
1
0
VFSEL
DUTY
SLF
17
9
fc/2
, fs/2
16
8
fc/2
, fs/2
15
fc/2
13
fc/2
Duty
Timing
control
control
Blanking
control
Common driver
COM0
to
COM3
Figure 15-1 LCD Driver
Page 153
DBR
display data area
Display data select control
Display data buffer register
Segment driver
SEG0
TMP86PM29BUG
SEG31
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