71m6543h-igtr/f Maxim Integrated Products, Inc., 71m6543h-igtr/f Datasheet - Page 61

• Manufacturer Part Number: 71m6543h-igtr/f
• Description: Energy Meter Ic
• Manufacturer: Maxim Integrated Products, Inc.

2.5.10.3 LCD Drivers
The LCD drivers are grouped into up to six commons (COM0 – COM5) and up to 56 segment drivers.
The LCD interface is flexible and can drive 7-segment digits, 14-segment digits or enunciator symbols.
A voltage doubler and a contrast DAC generate VLCD from either VBAT or V3P3SYS, depending on the
V3P3SYS voltage. The voltage doubler, while capable of driving into a 500 kΩ load, is able to generate a
maximum LCD voltage that is within 1 V of twice the supply voltage. The doubler and DAC operate from
a trimmed low-power reference.
The configuration of the VLCD generation is controlled by the I/O RAM field LCD_VMODE[1:0] (I/O RAM
0x2401[7:6]). It is decoded into LCD_EXT, LDAC_E, and LCD_BSTE.
LCD_VMODE[1:0] configurations.
v1.0
Configuration:
0 = DIO, 1 = LCD
SEG Data Register
DIO Data Register
Direction Register:
0 = input, 1 = output
SEGDIO
Pin #
Table 50: Data/Direction Registers for SEGDIO32 to SEGDIO45
Table 51: Data/Direction Registers for SEGDIO51 to SEGDIO55
Configuration:
0 = DIO, 1 = LCD
SEG Data Register
DIO Data Register
Direction Register:
0 = input, 1 = output
SEGDIO
Pin #
© 2008–2011 Teridian Semiconductor Corporation
32
32
32
32
7
0
33
33
33
33
6
1
34
34
34
34
5
2
LCD_MAP[39:32]
(I/O RAM 0x2407)
51
53
51
51
51
0
35
35
35
35
4
3
LCD_SEGDIO32[5:0] to LCD_SEGDIO45[5:0]
LCD_SEGDIO51[5:0] to LCD_SEGDIO55[5:0]
LCD_SEGDIO32[0] to LCD_SEGDIO45[0]
LCD_SEGDIO32[1] to LCD_SEGDIO45[1]
LCD_SEGDIO51[0] to LCD_SEGDIO55[0]
LCD_SEGDIO51[1] to LCD_SEGDIO55[1]
52
52
52
52
52
(I/O RAM 0x2430[5:0] to 0x243D[5:0])
1
(I/O RAM 0x2443[5:0] to 0x2447[5:0])
36
36
36
36
(I/O RAM 0x2430[0] to 0x243D[0])
(I/O RAM 0x2430[1] to 0x243D[1])
3
4
(I/O RAM 0x2443[0] to 0x2447[0])
(I/O RAM 0x2443[1] to 0x2447[1])
53
51
53
53
53
2
37
37
37
37
2
5
LCD_MAP[55:48]
(I/O RAM 0x2405)
54
47
54
54
54
3
38
38
38
38
1
6
55
46
55
55
55
4
100
39
39
39
39
7
–
–
–
–
–
Table 52
40
99
40
40
40
0
41
98
41
41
41
(I/O RAM 0x2406[5:0])
1
–
–
–
–
–
LCD_MAP[45:40]
71M6543F/H Data Sheet
details the
42
97
42
42
42
2
–
–
–
–
–
43
96
43
43
43
3
44
95
44
44
44
4
45
94
45
45
45
5
61