71M6521DE/71M6521FE
Energy Meter IC
DATASHEET
JANUARY 2008
EECTRL Byte Written
INT5
CNT Cycles (6 shown)
Write -- With HiZ
SCLK (output)
D7
D6
D5
D4
D3
D2
SDATA (output)
SDATA output Z
BUSY (bit)
(LoZ)
(HiZ)
Figure 10: 3-Wire Interface. Write Command, HiZ=1
EECTRL Byte Written
INT5
CNT Cycles (8 shown)
READ
SCLK (output)
D7
D6
D5
D4
D3
D2
D1
D0
SDATA (input)
SDATA output Z
BUSY (bit)
(HiZ)
Figure 11: 3-Wire Interface. Read Command.
EECTRL Byte Written
EECTRL Byte Written
INT5 not issued
CNT Cycles (0 shown)
INT5 not issued
CNT Cycles (0 shown)
Write -- No HiZ
Write -- HiZ
SCLK (output)
SCLK (output)
D7
SDATA (output)
SDATA output Z
BUSY (bit)
SDATA (output)
SDATA output Z
BUSY (bit)
(LoZ)
(HiZ)
Figure 12: 3-Wire Interface. Write Command when CNT=0
EECTRL Byte Written
INT5
CNT Cycles (6 shown)
Write -- With HiZ and WFR
SCLK (output)
D7
D6
D5
D4
D3
D2
BUSY
READY
SDATA (out/in)
(From 6520)
(From EEPROM)
(LoZ)
(HiZ)
SDATA output Z
BUSY (bit)
Figure 13: 3-Wire Interface. Write Command when HiZ=1 and WFR=1.
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© 2005-2008 TERIDIAN Semiconductor Corporation
v1.0
TERIDIAN [ TERIDIAN SEMICONDUCTOR CORPORATION ]
