Rainbow-electronics MAX6660 Manual do Utilizador descarregar pdf (Página 12)

MAX6660

Remote-Junction Temperature-Controlled

Fan-Speed Regulator with SMBus Interface

12 ______________________________________________________________________________________

(rather than the 8-bit READ BYTE), the LSB contains the

data and the MSB contains 00h in both cases.

Slave Addresses

The MAX6660 can be programmed to have one of nine

different addresses by pin strapping ADD0 and ADD1

so that up to nine MAX6660s can reside on the same

bus without address conflicts. See Table 7 for address

information.

The address pin state is checked at POR only, and the

address data stays latched to reduce quiescent supply

current due to the bias current needed for high-Z state

detection.

The MAX6660 also responds to the SMBus Alert

Response slave address (see the Alert Response

Address section).

POR and UVLO

The MAX6660 has a volatile memory. To prevent unreli-

able power-supply conditions from corrupting the data

in memory and causing erratic behavior, a POR voltage

detector monitors V

and clears the memory if V

falls below 1.91V (typ, see Electrical Characteristics).

When power is first applied and V

rises above 2.0V

(typ), the logic blocks begin operating, although reads

and writes at V

levels below 3.0V are not recom-

mended. A second V

comparator, the ADC under-

voltage lockout (UVLO) comparator prevents the ADC

from converting until there is sufficient headroom (V

= 2.8V typ).

The SPOR software POR command can force a power-on

reset of the MAX6660 registers through the serial interface.

Use the SEND BYTE protocol with COMMAND = FCh.

REGISTERS COMMAND POR STATE FUNCTION

RRL 00h 00000000 Read Remote Temperature Low Byte (3MSBs)

RRH 01h 00000000 Read Remote Temperature High Byte (Sign Bit and First 7 Bits)

RSL 02h 00000000 Read Status Byte

RCL/WCL 03h/09h 00000000 Read/Write Configuration Byte

RFCR/WFCR 04h/0Ah 00000010 Read/Write Fan-Conversion Rate Byte

RTMAX/WTMAX 10h/12h 01100100 at +100°C Read/Write Remote T

MAX

RTHYST/WTHYST 11h/13h 01011111 at +95°C Read/Write Remote T

HYST

RTHIGH/WTHIGH 07h/0Dh 01111111 at +127°C Read/Write Remote T

HIGH

RTLOW/WTLOW 08h/0Eh 11001001 at -55°C Read/Write Remote T

LOW

SPOR FCh N/A Write Software POR

OSHT 0Fh N/A Write One-Shot Temperature Conversion

RTFAN/WTFAN 14h/19h 00111100 at +60°C Read/Write Fan-Control Threshold Temperature T

FAN

RFSC/WFSC 15h/1Ah 00000000 Read/Write Fan-Speed Control

RFG/WFG 16h/1Bh 10000000 Read/Write Fan Gain

RFTC 17h 00000000 Read Fan Tachometer Count

RFTCL/WFTCL 18h/1Ch 11111111 Read/Write Fan Tachometer Count Limit (Fan Failure Limit)

RFCD/WFCD 1Dh/1Eh 00000001 Read/Write Fan Count Divisor

RFS/WFS 1Fh/20h 11111111 Read/Write Full-Scale Register

RM/WM FAh/FBh 00000000 Read/Write Mode Register

ID Code FEh 01001101 Read Manufacturer ID Code

ID Code 9Dh 00001001 Read Device ID Code

Table 4. Command-Byte Bit Assignments

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 20 21

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