TC654 datasheet(21/36 Pages) MICROCHIP

21 / 36 page

 2002 Microchip Technology Inc.

DS21734A-page 21

TC654/TC655

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.

DUTY-CYCLE REGISTER

(DUTY_CYCLE)

6.6

Manufacturer’s Identification

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.

MANUFACTURER’S

IDENTIFICATION

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.

VERSION ID REGISTER

(VER_ID)

D(3)

D(2)

D(1)

D(0)

Duty-Cycle

000

30%

34.67%

39.33% (default for VIN

open and when SMBus

is not selected)

001

44%

48.67%

53.33%

011

58%

62.67%

67.33%

100

72%

76.67%

81.33%

110

86%

90.67%

95.33%

111

100%

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

D[1] D[0] Version

TC654

TC655

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