Rainbow Electronics MAX16064 - Manual (Page 30)

MAX16064
±0.3% Accurate, Quad, Power-Supply Controller with
Active-Voltage Output Control and PMBus Interface
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S = START CONDITION
SR = REPEATED START CONDITION
P
= STOP CONDITION
= SLAVE TRANSMISSION
COMMAND
BYTE FOR
DEVICE 1 DATA BYTES
FOR DEVICE 1 SLAVE
ADDRESS OF
DEVICE 1
COMMAND BYTE
FOR DEVICE n: NO
DATA BYTE SLAVE
ADDRESS OF
DEVICE n
COMMAND
BYTE FOR
DEVICE 2 DATA BYTES
FOR DEVICE 2 SLAVE
ADDRESS OF
DEVICE 2
COMMAND
BYTE FOR
DEVICE 3 DATA BYTES
FOR DEVICE 3 SLAVE
ADDRESS OF
DEVICE 3
DATA0 A DATA1 A
8 BITS 8 BITS
S ADDR1 W A CMD1 A
7 BITS 8 BITS
SR ADDRn W A CMDn A
7 BITS 8 BITS
DATA0 A
8 BITS
SR ADDR2 W A CMD2 A
7 BITS 8 BITS
DATA0 A DATA1 A
8 BITS 8 BITS
SR ADDR3 W A CMD3 A
7 BITS 8 BITS
PEC1
8 BITS
A
DATA1 A
8 BITS
PEC2
8 BITS
A
PEC3
8 BITS
A
PECn
8 BITS
A P
Figure 15. SMBus Group Command Protocol with PEC
SCL
SDA
A
A = START CONDITION
B = MSB OF ADDRESS CLOCKED INTO SLAVE
C = LSB OF ADDRESS CLOCKED INTO SLAVE
D = R/W BIT CLOCKED INTO SLAVE
E = SLAVE PULLS SDA LINE LOW F = ACKNOWLEDGE BIT CLOCKED INTO MASTER
G = MSB OF DATA CLOCKED INTO MASTER
H = LSB OF DATA CLOCKED INTO MASTER
I = MASTER PULLS SDA LINE LOW J = ACKNOWLEDGE CLOCKED INTO SLAVE
K = ACKNOWLEDGE CLEAR PULSE
L = STOP CONDITION
M = NEW START CONDITION
B C D E F G H I J K L M
t SU;STA t HD;STA t SU;DAT t HD;DAT t SU;STO t BUF
t LOW t HIGH
Figure 16. SMBus Write Timing Diagram