TC654 datasheet(14/36 Pages) MICROCHIP

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TC654/TC655

DS21734A-page 14

 2002 Microchip Technology Inc.

When the TC654/TC655 devices are brought out of a

shutdown mode by resetting SDM (bit 0<0>) in the

Configuration Register, all of the registers (except for

the Configuration and FAN_FAULT1 & 2 registers)

assume their default power up states. The Configura-

tion Register and the FAN_FAULT1 & 2 Registers

maintain the states they were in prior to the device

being put into the shutdown mode. Since these are the

registers which control the parts operation, the part

does not have to be reprogrammed for operation when

it comes out of shutdown mode.

4.10

SMBus Interface (SCLK & SDA)

The TC654/TC655 feature an industry-standard, 2-wire

serial interface with factory-set addresses. By commu-

nicating with the TC654/TC655 device registers, func-

tions like PWM duty cycle, low power shutdown mode

and fan RPM threshold can be controlled. Critical infor-

mation, such as fan fault, over temperature and fan

RPM, can also be obtained via the device data regis-

ters. The available data and control registers make the

TC654/TC655 devices very flexible and easy to use. All

of the available registers are detailed in Section 6.0.

4.11

SMBus Slave Address

The slave address of the TC654/TC655 is 0011 011

and

is fixed. This address is different from industry-

standard digital temperature sensors (like TCN75) and,

therefore, allow the TC654/TC655 to be utilized in sys-

tems in conjunction with these components. Please

contact Microchip

Technology

Inc.

alternate

addresses are required.

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