Datasheet

6-Channel Intelligent Fan Controller
MAX31785
23
Figure 1. Automatic Fan Control
Figure 2. Fan Speed Example
EACH FAN HAS A
UNIQUE 8-LEVEL LUT
HIGHEST TEMPERATURE
CONTROLS THE FAN
TEMP SENSOR TO
FAN MAPPING
OFFSET ADJUSTMENT
ALLOWS TEMPERATURE ZONE
NORMALIZATION
REMOTE DIODE
TEMP SENSOR 0
+15°C
FAN 2
FAN 5
TEMP SENSOR DIODE 0
FAN 0 1 2 3 4 5
REMOTE DIODE
TEMP SENSOR 1
+10°C
TEMP SENSOR DIODE 1
FAN 0 1 2 3 4 5
REMOTE DIODE
TEMP SENSOR 2
0°C
TEMP SENSOR DIODE 2
FAN 0 1 2 3 4 5
I
2
C REMOTE
TEMP SENSOR 3
0°C
TEMP SENSOR I
2
C 3
FAN 0 1 2 3 4 5
INTERNAL
TEMP SENSOR
+5°C
TEMP SENSOR INTERNAL
FAN 0 1 2 3 4 5
T1
T2
T3
T4
T5
T6
T7
SENSOR
TEMPERATURE
THERMAL
HYSTERESIS
T0
ELAPSED TIME
TEMPERATURE SAMPLE RATE
(ONCE PER SECOND)
S1
S2
S3
S4
S5
S6
S7
FAN SPEED
SAMPLE 1
SAMPLE 2
SAMPLE 3
SAMPLE 4
SAMPLED TEMPERATURES
S0