HT0324A Tomato LSI, Inc., HT0324A Datasheet - Page 28

• Manufacturer Part Number: HT0324A
• Description: 65COM / 132SEG DRIVER & CONTROLLER FOR STN LCD
• Manufacturer: Tomato LSI, Inc.

HT0324A
TOMATO LSI Inc.
Table 6-9. Internal Rb / Ra ratio depending on 3-bit Data (R2, R1, R0)
The following figure shows V0 voltage measured by adjusting internal regulator resistor ratio (Rb / Ra) and
6-bit electronic volume registers for each temperature coefficient at Ta = 25 C.
b-1. In case of using internal resistors, Ra and Rb (INTRS = "H")
When INTRS pin is “H”, resistor Ra is connected internally between VR pin and V
between V0 and VR. We determine V0 by two instructions, "Regulator resistor select" and "Set reference
voltage".
1+(Rb/Ra)
V0[V]
16
14
12
10
8
6
4
2
0
65COM / 132SEG DRIVER & CONTROLLER FOR STN LCD
000
0
3.0
5
28
10
001
3.5
15
Figure 6-13. Electronic volume level
20
010
4.0
25
El ect r oni c vol um e l evel
3-bit data settings(R2 R1 R0: gain)
30
35
011
4.5
40
45
100
5.0
50
55
60
101
5.5
63
SS
, and Rb is connected
Ver 0.0
gai n 111
gai n 110
gai n 101
gai n 100
gai n 011
gai n 010
gai n 001
gai n 000
110
6.0
111
6.4