71M6521DE Datasheet, PDF (65/101 Pages) Teridian Semiconductor Corporation – Energy Meter IC

71M6521DE/71M6521FE
Energy Meter IC
DATASHEET
JANUARY 2008
LCD_NUM
SEG in Addition
to SEG0-SEG18
Total Number of LCD
Segment Pins In-
cluding SEG0-SEG18
DIO Pins in Addition
to DIO1-DIO2
Total Number of DIO
Pins Including DIO1,
DIO2
0
-
19
4-11, 14-17
14
1
-
19
4-11, 14-17
14
2
-
19
4-11, 14-17
14
3
-
19
4-11, 14-17
14
4
-
19
4-11, 14-17
14
5
37
20
4-11, 14-16
13
6
36-37
21
4-11, 14-15
12
7
35-37
22
4-11, 14
11
8
34-37
23
4-11
10
9
34-37
23
4-11
10
10
34-37
23
4-11
10
11
31, 34-37
24
4-10
9
12
30-31, 34-37
25
4-9
8
13
29-31, 34-37
26
4-8
7
14
28-31, 34-37
27
4-7
6
15
27-31, 34-37
28
4-6
5
16
26-31, 34-37
29
4-5
4
17
25-31, 34-37
30
4
3
18
24-31, 34-37
31
None
2
Note: LCD segment numbers are given without CKTEST/SEG19, E_RXTX/SEG38, E_TCLK/SEG33, and E_RST/SEG32.
Table 63: LCD and DIO Pin Assignment by LCD_NUM for the LQFP-64 Package
Connecting I²C EEPROMs
I²C EEPROMs or other I²C compatible devices should be connected to the DIO pins DIO4 and DIO5, as shown in Figure 33.
Pull-up resistors of roughly 10kΩ to V3P3D (to ensure operation in BROWNOUT mode) should be used for both SCL and SDA
signals. The DIO_EEX register in I/O RAM must be set to 01 in order to convert the DIO pins DIO4 and DIO5 to I²C pins SCL
and SDA
10kΩ
71M6521
V3P3D
10kΩ
EEPROM
DIO4
DIO5
SCL
SDA
.
Figure 33: I²C EEPROM Connection
v1.0
© 2005-2008 TERIDIAN Semiconductor Corporation
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