ADT7476A
www.onsemi.com
2
Figure 1. Functional Block Diagram
ADT7476A
PWM REGISTERS
AND CONTROLLERS
(HF AND LF)
AUTOMATIC
FAN SPEED
CONTROL
FAN SPEED
COUNTER
PERFORMANCE
MONITORING
THERMAL
PROTECTION
INPUT
SIGNAL
CONDITIONING
AND
ANALOG
MULTIPLEXER
BAND GAP
TEMP. SENSOR
V
CC
TO ADT7476A
10-BIT
ADC
BAND GAP
REFERENCE
SMBus
ADDRESS
SELECTION
SERIAL BUS
INTERFACE
ADDRESS
POINTER
REGISTER
PWM
CONFIGURATION
REGISTERS
INTERRUPT
MASKING
INTERRUPT
STATUS
REGISTERS
VALUE AND
LIMIT
REGISTERS
LIMIT
COMPARATORS
GND
ADDR
SELECT
ADDREN
SCL
SDA
SMBALERT
PWM1
PWM2
PWM3
TACH1
TACH2
TACH3
TACH4
THERM
V
CC
D1+
D1−
D2+
D2−
+5V
IN
VID/GPIO
REGISTER
+12V
IN
+2.5V
IN
V
CCP
VID0/GPIO0
VID1/GPIO1
VID2/GPIO2
VID3/GPIO3
VID4/GPIO4
VID5/GPIO5
GPIO6
ACOUSTIC
ENHANCEMENT
CONTROL
Figure 2. Serial Bus Timing Diagram
P
S
t
SU; DAT
t
HIGH
t
F
t
HD; DAT
t
R
t
LOW
t
SU; STO
P
S
SCL
SDA
t
BUF
t
HD; STA
t
HD; STA
t
SU; STA
Downloaded from
Downloaded from
