ADT7473 Analog Devices, Inc., ADT7473 Datasheet - Page 66

• Manufacturer Part Number: ADT7473
• Description: Dbcool Remote Thermal Monitor And Fan Controller
• Manufacturer: Analog Devices, Inc.

ADT7473
Table 34. Register 0x5C, Register 0x5D, and Register 0x5E—Configuration Register
Bit
[2:0]
[3]
[4]
[7:5]
Table 35. TEM
R
0x5F
0x60
0x61
1
These registers become read-only when the Configuration Register 1 lock bit is set. Any further attempts to write to these registers have no effect.
egister Address
N me
SP
SLOW
INV
BHVR
P T
a
IN
RANGE
R/W
R/W
R/W
R/W
/PWM Frequency Registers
1
R/W
R/W
R/W
R/W
R/W
Description
Remote 1 T
Local temperature T
Remote 2 T
Description
These bits control the start-up timeout for PWMx. The PWM output stays high until two
valid TACH rising edges are seen from the fan. If there is not a valid TACH signal during the
fan TACH measurement directly after the fan start-up
mea
minimum high and low bytes contain 0xFFFF or 0x0000, then the Interrupt Status Register
2 bit is not set, ev
000 = No
001 = 10 0 ms.
010 = 250 ms (default).
011 = 40 0 ms.
100 = 66 7 ms.
101 = 1 s ec.
110 = 2 s ec.
111 = 4 sec.
SLOW = 1 makes the ramp rates for acoustic enhancement four times longer.
This bit inverts the PWM output. The default is 0, which corre
for 100% duty cycle. Setting this bit to 1 inverts t
corresponds to a logic low output.
These bits assign each fan to a particular temperature sensor for localized cooling.
000 = Remote 1 temperatur
001 = Local temperature controls PWM
010 = Remote 2 temperature controls PWMx (automatic fan control mode).
011 = PWMx runs full speed.
100 = PWMx disabled (de
101 = Fastest speed calculated by local a
110 = Fastest speed calculated by all three temperature channel controls PWMx.
111 = Manual mode. PWM duty cycle registers (Register 0x30 to Register 0x32) become
writable.
sure
RANGE
RANGE
ment reads 0xFFFF and In
start-up t
/PWM1 frequency.
/PWM3 frequency.
Rev. A | Page 66 of 76
RANGE
en if the fan has not star
imeout.
/PWM2 frequency.
fault).
e controls PWMx (automatic fan control mode).
terrupt Status Register 2 reflects the fan fault. If the TACH
x (automatic fan control mode).
s (Power-On Default = 0x82)
nd Remote 2 temperature controls PWMx.
ted.
he PWM output, so 100% duty cycle
timeout period, then the TACH
Power-On Default
0xCC
0xCC
0xCC
sponds to a logic high output