Rainbow-electronics MAX6660 Manual de usuario descargar pdf (Pagina 17)

MAX6660

Remote-Junction Temperature-Controlled

Fan-Speed Regulator with SMBus Interface

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ADDRESS

FCD (1Dh = READ, 1Eh = WRITE)

COMMAND READ LIMIT/FAILURE REGISTER

Bit 7 6543210

POR State 00000001

Table 12. Fan Count Divisor Register (RFCD/WFCD)

Notes: This byte sets the prescalar division ratio for tachometer or current-sense feedback. (This register does not apply to the tach

signal used in the Fan-Speed register). Select this value such that the fan frequency (RPM/60 x number of poles) divided by

the FCD falls in the 33Hz to 66Hz range. See TACH IN section.

Bits 1, 0: 00 = divide by 1, 01 = divide by 2, 10 = divide by 4, 11 = divide by 8.

TEMPDATA

4/5/6

REF FREQUENCY

8415Hz

127/255

1/64 COUNTER

FTC FTCL

COMPARATOR

FCD

1/2/4/8

FAN OPEN/CLOSED

LOOP

UP/DOWN

DRIVER

DAC

FAN FAIL

VFAN

FAN

TACH IN

Figure 7. MAX6660 Fan Loop Functional Diagram

1 2 ... 12 13 14 15 16 17 18 19 20 21

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Rainbow-electronics MAX6660 Manual de usuario Pagina 17