ADT7473 datasheet(66/76 Pages) AD

Part #	ADT7473

Description	dBCool Remote Thermal Monitor and Fan Controller

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ADT7473

Rev. A | Page 66 of 76

s (Power-On Default = 0x82)

a

Description

Table 34. Register 0x5C, Register 0x5D, and Register 0x5E—Configuration Register

Bit

N me

R/W

[2:0]

SP

timeout period, then the TACH

sure

terrupt Status Register 2 reflects the fan fault. If the TACH

minimum high and low bytes contain 0xFFFF or 0x0000, then the Interrupt Status Register

2 bit is not set, ev

ted.

IN

R/W

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

ment reads 0xFFFF and In

en if the fan has not star

000 = No

imeout.

start-up t

001 = 100 ms.

010 = 250 ms (default).

011 = 400 ms.

100 = 667 ms.

101 = 1 sec.

110 = 2 sec.

111 = 4 sec.

[3]

SLOW

R/W

SLOW = 1 makes the ramp rates for acoustic enhancement four times longer.

[4]

INV

sponds to a logic high output

he PWM output, so 100% duty cycle

R/W

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.

[7:5]

BHVR

R/W

These bits assign each fan to a particular temperature sensor for localized cooling.

e controls PWMx (automatic fan control mode).

000 = Remote 1 temperatur

x (automatic fan control mode).

001 = Local temperature controls PWM

010 = Remote 2 temperature controls PWMx (automatic fan control mode).

011 = PWMx runs full speed.

fault).

100 = PWMx disabled (de

nd Remote 2 temperature controls PWMx.

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.

P TRANGE/PWM Frequency Registers

egister Address

R/W1

Description

Power-On Default

Table 35. TEM

R

0x5F

R/W

Remote 1 TRANGE/PWM1 frequency.

0xCC

0x60

R/W

Local temperature TRANGE/PWM2 frequency.

0xCC

0x61

R/W

Remote 2 TRANGE/PWM3 frequency.

0xCC

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.

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