TC654(2002) View Datasheet(PDF) - Microchip Technology

Part Name

Description

Manufacturer

TC654
(Rev.:2002)

Dual SMBus™ PWM Fan Speed Controllers With Fan Fault Detection

Microchip Technology 

6.5 DUTY-CYCLE Register

(DUTY_CYCLE)

The DUTY_CYCLE register is a 4-bit read/writable reg-

ister used to control the duty cycle of the VOUT output.

The controllable duty cycle range via this register is

30% to 100%, with programming steps of 4.67%.This

method of duty cycle control is mainly used with the

SMBus interface. However, if the VIN method of duty

cycle control has been selected (or defaulted to), and

the VIN pin is open, the duty cycle will go to the default

setting of this register, which is 0010 (39.33%). The

duty cycle settings are shown in Register 6-5.

REGISTER 6-5: DUTY-CYCLE REGISTER

(DUTY_CYCLE)

D(3) D(2) D(1) D(0)

Duty-Cycle

0

0

0

0 30%

0

0

0

1 34.67%

0

0

1

0 39.33% (default for VIN

open and when SMBus

is not selected)

0

0

1

1 44%

0

1

0

0 48.67%

0

1

0

1 53.33%

0

1

1

0 58%

0

1

1

1 62.67%

1

0

0

0 67.33%

1

0

0

1 72%

1

0

1

0 76.67%

1

0

1

1 81.33%

1

1

0

0 86%

1

1

0

1 90.67%

1

1

1

0 95.33%

1

1

1

1 100%

TC654/TC655

6.6 Manufacturer’s Identification

Register (MFR_ID)

This register allows the user to identify the manufac-

turer of the part. The MFR_ID register is an 8-bit Read

only register. See Register 6-6 for the Microchip manu-

facturer ID.

REGISTER 6-6:

MANUFACTURER’S

IDENTIFICATION

REGISTER (MFR_ID)

D[7] D[6] D[5] D[4] D[3] D[2] D[1] D[0]

01010100

6.7 Version ID Register (VER_ID)

This register is used to indicate which version of the

device is being used, either the TC654 or the TC655.

This register is a simple 2-bit Read only register.

REGISTER 6-7: VERSION ID REGISTER

(VER_ID)

D[1] D[0] Version

0 0 TC654

0 1 TC655

 2002 Microchip Technology Inc.

DS21734A-page 21

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