TPS62400_14 Datasheet, PDF (22/43 Pages) Texas Instruments – 2.25MHz 400mA/600mA Dual Step-Down Converter In Small 3x3mm QFN Package

TPS62400, TPS62401
TPS62402, TPS62403, TPS62404
SLVS681E – JUNE 2006 – REVISED APRIL 2010
www.ti.com
The device enters forced PWM mode operation immediately whenever the MODE/DATA pin turns to high level.
The device also stays in forced PWM mode during the entire protocol reception time.
With a falling edge on the MODE/DATA pin the device starts bit decoding. If the MODE/DATA pin stays low for at
least t_timeout, the device gets an internal timeout and Power Save Mode operation is enabled.
A protocol sent within this time is ignored because the falling edge for the Mode change is first interpreted as
start of the first bit. In this case it is recommended to send the protocol first, and then change at the end of the
protocol to Power Save Mode.
DATA IN
Device Address
DATABYTE
SSttaarrtt DA7 DA6 DA5 DA4 DA3 DA2 DA1 DA0 EOS Start RFA A1 A0 D4 D3 D2 D1 D0 EOS
010 0 11 1 0
DATA OUT ACK
Figure 35. EasyScale™ Protocol Overview
BYTE
Device
Address
Byte
4Ehex
Databyte
BIT
NUMBER
7
6
5
4
3
2
1
0
7(MSB)
6
5
4
3
2
1
0(LSB)
NAME
DA7
DA6
DA5
DA4
DA3
DA2
DA1
DA0
RFA
A1
A0
D4
D3
D2
D1
D0
ACK
Table 3. EasyScale™ Bit Description
TRANSMISSION
DIRECTION
DESCRIPTION
IN
0 MSB device address
IN
1
IN
0
IN
0
IN
1
IN
1
IN
1
IN
0 LSB device address
IN
Request For Acknowledge, if high, Acknowledge condition will applied by the device
Address Bit 1
Address Bit 0
Data Bit 4
Data Bit 3
Data Bit 2
Data Bit 1
Data Bit 0
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!
t_Start
Address Byte
t_Start
DATA Byte
DATA IN
Mode, Static
High or Low
DA7
DA0
RFA
D0
0
0
T_EOS
0
1
Figure 36. EasyScale™ Protocol Without Acknowledge
Mode, Static
High or Low
T_EOS
22
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