TPS65132_016 Datasheet, PDF (17/65 Pages) Texas Instruments – Single Inductor - Dual Output Power Supply

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TPS65132
SLVSBM1H – JUNE 2013 – REVISED NOVEMBER 2016
8.5 Programming
8.5.1 I²C Serial Interface Description
The TPS65132 communicates through an industry standard I²C compatible interface, to receive data in slave
mode. I²C is a 2-wire serial interface developed by Philips Semiconductor (see I²C-Bus Specification, Version
2.1, January 2000).
The TPS65132 integrates a non-volatile memory (EEPROM) that allows the storage of the register values with a
capability of up to 1000 programming cycles. At startup the TPS65132 loads first the EEPROM content into the
registers and uses these voltages to start.
It is recommended to stop I²C communication with the TPS65132 for 50 ms after the command "Write EEPROM
data" was sent. If the device is accessed via I²C during EEPROM programming, the device will pull down the
SCL line (clock stretch) after it recognized its I²C address. The SCL line will be released after EEPROM
programming is finished.
The TPS65132 works as a slave and supports the following data transfer modes, as defined in the I²C-Bus
specification: standard mode (100 kbps) and fast mode (400 kbps). The data transfer protocol for standard and
fast modes is exactly the same, therefore they are referred to as F/S-mode in this document. The TPS65132
supports 7-bit addressing. The device 7-bit address is 3E (see Figure 8), and the LSB enables the write or read
function.
Figure 8. TPS65132 Slave Address Byte
MSB
TPS65132
Address
0
1
1
1
1
1
R/W = R/(W)
LSB
0
R/W
NOTE
With TPS65132Ax, the I²C interface is accessible as long as the input voltage is above
the undervoltage lockout threshold. In all other versions, the I²C interface is accessible
only as soon as one of the enable pins is pulled HIGH while the input voltage is above the
undervoltage lockout.
8.5.2 I²C Interface Protocol
1
7
1
1
8
1
S
Slave Address
R/W A
Register Address
A
“0” Write
8
Data Register
1
1
A
P
From Master to Slave
From Slave to Master
A = Acknowledge (SDA LOW)
A = Not Acknowledge (SDA HIGH)
S = START condition
Sr = REPEATED START condition
P = STOP condition
Figure 9. “Write" Data To DAC – Transfer Format In F/S-Mode
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