71M6521DE Datasheet, PDF (45/107 Pages) Teridian Semiconductor Corporation – Energy Meter IC

71M6521DE/DH/FE Data Sheet
EECTRL Byte Written
READ
SCLK (output)
CNT Cycles (8 shown)
INT5
SDATA (input)
D7
D6
D5
D4
D3
D2
D1
D0
SDATA output Z
(HiZ)
BUSY (bit)
Figure 11: 3-Wire Interface. Read Command.
EECTRL Byte Written
Write -- No HiZ
SCLK (output)
INT5 not issued
EECTRL Byte Written
CNT Cycles (0 shown)
Write -- HiZ
SCLK (output)
INT5 not issued
CNT Cycles (0 shown)
SDATA (output)
D7
SDATA (output)
SDATA output Z
(LoZ)
SDATA output Z
(HiZ)
BUSY (bit)
BUSY (bit)
Figure 12: 3-Wire Interface. Write Command when CNT=0
EECTRL Byte Written
Write -- With HiZ and WFR
SCLK (output)
CNT Cycles (6 shown)
INT5
SDATA (out/in)
SDATA output Z
D7
D6
D5
D4
D3
D2
(From 6520)
(LoZ)
BUSY
(From EEPROM)
(HiZ)
READY
BUSY (bit)
Figure 13: 3-Wire Interface. Write Command when HiZ=1 and WFR=1.
Rev 2
Page: 45 of 107