71M6541D Datasheet, PDF (160/166 Pages) Maxim Integrated Products – 0.1% Accuracy Over 2000:1 Current Range Energy Meter ICs

71M6541D/F/G and 71M6542F/G Data Sheet
6.9.3 Digital Pins
Table 121 lists the digital pins. Pin types: P = Power, O = Output, I = Input, I/O = Input/Output, N/C = no
connect. The circuit number denotes the equivalent circuit, as specified in 6.9.4 I/O Equivalent Circuits.
Table 121: Digital Pins
Pin
(64-pin)
4-7
Pin
(100-pin)
12–15
Name
COM0–COM3
Type Circuit
Function
O
5
LCD Common Outputs. These four pins provide the select
signals for the LCD display.
31
45
SEGDIO0/WPULSE
30
44
SEGDIO1/VPULSE
29
43
SEGDIO2/SDCK
28
42
SEGDIO3/SDATA
27
41
SEGDIO4
26
25
24
23
22-17
--
--
39
38
37
36
35–30
29-27
25
SEGDIO5
SEGDIO6/XPULSE
SEGDIO7/YPULSE
SEGDIO8/DI
SEGDIO[9:14]
SEGDIO[15:17]
SEGDIO[18]
Multiple-Use Pins. Configurable as either LCD segment
driver or DIO. Alternative functions with proper selection of
associated I/O RAM registers are:
SEGDIO0 = WPULSE
SEGDIO1 = VPULSE
SEGDIO2 = SDCK
I/O 3, 4, 5 SEGDIO3 = SDATA
SEGDIO6 = XPULSE
SEGDIO7 = YPULSE
SEGDIO8 = DI
16-10
--
24–18
11–4
SEGDIO[19:25]
SEGDIO[28:35]
Unused pins must be configured as outputs or
terminated to V3P3/GNDD.
63-62
95-94
SEGDIO[44:45]
--
99–96
SEGDIO[40:43]
--
52
SEGDIO52
--
51
SEGDIO53
--
47
SEGDIO54
9
17
SEGDIO26/COM5
Multiple-Use Pins. Configurable as either LCD segment
I/O 3, 4, 5 driver or DIO with alternative function (LCD common
8
16
SEGDIO27/COM4
drivers).
3
3
SPI_CSZ/SEGDIO36
2
1
2
1
SPI_DO/SEGDIO37
SPI_DI/SEGDIO38
I/O
3, 4, 5
Multiple-Use Pins. Configurable as either LCD segment
driver or DIO with alternative function (SPI interface).
64
100 SPI_CKI/SEGDIO39
33
32
53
46
OPT_TX/SEGDIO51
OPT_RX/SEGDIO55
I/O
3, 4, 5
Multiple-Use Pins, configurable as either LCD segment
driver or DIO with alternative function (optical port/UART1)
38
36
58
56
E_RXTX/SEG48
E_RST/SEG50
I/O
1, 4, 5
Multiuse Pins. Configurable as either emulator port pins
(when ICE_E pulled high) or LCD segment drivers (when
37
57
E_TCLK/SEG49
O
4, 5 ^{ICE_E tied to GND).}