Datasheet

DA7
0
t
Start
Mode,Static
HighorLow
Mode,Static
HighorLow
DATA IN
t
Start
T
EOS
T
EOS
DA0
0
RFA
0
D0
1
AddressByte DATA Byte
Mode,Static
HighorLow
t
ACKN
Acknowledge
true,DataLine
pulleddownby
device
DATA IN
DATA OUT
Acknowledge
false,nopull
down
Controllerneedsto
PullupDataLineviaa
resistortodetect ACKN
ACKN
DA7
0
Mode,Static
HighorLow
T
EOS
t
valACK
DA0
0
RFA
1
D0
1
t
Start
t
Start
AddressByte DATA Byte
TPS62420-Q1
SLVSA56 –DECEMBER 2009 www.ti.com
Table 2. Easy Scale Bit Description
BYTE BIT NAME TRANSMISSION DESCRIPTION
NUMBER DIRECTION
Device 7 DA7 IN 0 MSB device address
Address
6 DA6 IN 1
Byte
5 DA5 IN 0
4 DA4 IN 0
4Ehex 3 DA3 IN 1
2 DA2 IN 1
1 DA1 IN 1
0 DA0 IN 0 LSB device address
Databyte 7(MSB) RFA IN Request For Acknowledge, if high, Acknowledge condition will applied by the device
6 A1 Address Bit 1
5 A0 Address Bit 0
4 D4 Data Bit 4
3 D3 Data Bit 3
2 D2 Data Bit 2
1 D1 Data Bit 1
0(LSB) D0 Data Bit 0
ACK OUT Acknowledge condition active 0, this condition will only be applied in case RFA bit is
set. Open drain output, Line needs to be pulled high by the host with a pullup
resistor.
This feature can only be used if the master has an open drain output stage. In case
of a push pull output stage Acknowledge condition may not be requested!
Figure 29. Easy Scale Protocol Without Acknowledge
Figure 30. Easy Scale Protocol Including Acknowledge
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Product Folder Link(s): TPS62420-Q1