NCT7491RQR2G【PDF 37/80 页】IC REMOTE THERMAL MONITOR 24QSOP

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NCT7491

http://onsemi.com

GPIO1

" Bit 7 of register 0x80 sets GPIO1 direction. 1=Input,

0=Output

" Bit 5 of register 0x80 sets GPIO1 polarity. 1=active

high, 0=active low

" Bit 3 of register 0x80 is GPIO1 data. If GPIO1 is an

input this bit shows the pin state. If it is an output then

this bit sets the output state.

GPIO2

" Bit 6 of register 0x80 sets GPIO2 direction. 1=Input,

0=Output

" Bit 4 of register 0x80 sets GPIO2 polarity. 1=active

high, 0=active low

" Bit 2 of register 0x80 is GPIO2 data. If GPIO2 is an

input this bit shows the pin state. If it is an output then

this bit sets the output state.

GPIO3

" Bit 7 of register 0x85 sets GPIO3 direction. 1=Input,

0=Output

" Bit 6 of register 0x85 sets GPIO3 polarity. 1=active

high, 0=active low

" Bit 5 of register 0x85 is GPIO3 data. If GPIO3 is an

input this bit shows the pin state. If it is an output then

this bit sets the output state.

When writing to a GPIO pin that is configured as an output

the polarity must be taken into account. For example, if the

pin is set as active low then writing a 1 to the data bit will pull

the GPIO pin low.

When GPIOs are configured as inputs the data bit always

shows the actual pin state.

VCCP Low Detection

If the processor core voltage is being monitored on the

Vccp channel and the NCT7491 is run from the auxiliary

rail, then the user can enable a function to suspend various

functions in the NCT7491 when the core voltage falls below

a programmable threshold.

Setting bit 6 of register 0x10 enables the Vccp Low

function. In this mode, if the Vccp voltage falls below the

value in the Vccp Low Limit register (0x46) then the Vccp

status bit is set, the THERM timer function is disabled, PECI

errors are cleared, SMBus Master errors are cleared and all

PWM outputs shut down. When the Vccp voltage increases

above the Vccp Low Limit then any of the above functions

that were previously enabled will become active again.

XNOR Tree Test Mode

The NCT7491 includes an XNOR tree test mode. This

mode is useful for incircuit test equipment at boardlevel

testing. By applying stimulus to the pins included in the

XNOR tree, it is possible to detect opens, or shorts, on the

system board.

The XNOR tree test is invoked by setting Bit 0 (XEN) of

the XNOR Tree Test Enable register (Register 0x6F).

Figure 25 shows the signals that are exercised in the XNOR

tree test mode.

PWM1/XTO

PWM3

PWM2

TACH4

Figure 25. XNOR Tree Test

TACH3

TACH2

TACH1

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