DS6203B Datasheet, PDF (14/22 Pages) Richtek Technology Corporation – 5A, 18V, 700kHz ACOTTM Synchronous Step-Down Converter with VID Control

RT6203B
Application Information
I²C Interface Function
The 7-bit address of the RT6203B with a WRITE operation bit can become an 8 bits I²C address byte. By using user-
selectable A1 and A0 pins, there will be up to 4 the RT6203Bs been controlled on the same serial bus. Table 1 explains
how to use A1/A0 and the range of the RT6203B address.
A1
GND (0)
GND (0)
Pull high (1)
Pull high (1)
Table 1. Selectable RT6203B Address by using A1 and A0 pins
A0
RT6203 Address
(Binary)
RT6203 Address (Hex)
GND (0)
01101000
68h
Pull high (1)
01101010
6Ah
GND (0)
01101100
6Ch
Pull high (1)
01101110
6Eh
Table 2 is the structure of the RT6203B Data Byte. Bit0 to Bit6 are the 7-bit code for one of 77 output voltage and special
function. After the soft-start time, Master can sent 8 bits data to control the V_OUT of the RT6203B. The voltages can be
selected from table 3 and table 4 shows how to use special function. The bit7 is check-sum bit and Master should set
this bit to be the Exclusive-OR of [Bit6:Bit0]. In other words, the sum is even. If not, the RT6203B will not send an ACK
bit.
Table 2. Structure of RT6203B Data Byte
Bit7
Bit6
Bit5
Bit4
Bit3
Bit2
Bit1
Bit0
ChkSum
D6
D5
D4
D3
D2
D1
D0
Copyright ©2016 Richtek Technology Corporation. All rights reserved.
www.richtek.com
14
is a registered trademark of Richtek Technology Corporation.
DS6203B-00 September 2016