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Remote-Junction Temperature-Controlled
Fan-Speed Regulator with SMBus Interface
Table 4. Command-Byte Bit Assignments
REGISTERS
RRL
RRH
RSL
RCL/WCL
RFCR/WFCR
RTMAX/WTMAX
RTHYST/WTHYST
RTHIGH/WTHIGH
RTLOW/WTLOW
SPOR
OSHT
RTFAN/WTFAN
RFSC/WFSC
RFG/WFG
RFTC
RFTCL/WFTCL
RFCD/WFCD
RFS/WFS
RM/WM
ID Code
ID Code
COMMAND
00h
01h
02h
03h/09h
04h/0Ah
10h/12h
11h/13h
07h/0Dh
08h/0Eh
FCh
0Fh
14h/19h
15h/1Ah
16h/1Bh
17h
18h/1Ch
1Dh/1Eh
1Fh/20h
FAh/FBh
FEh
9Dh
POR STATE
00000000
00000000
00000000
00000000
00000010
01100100 at +100 ° C
01011111 at +95 ° C
01111111 at +127 ° C
11001001 at -55 ° C
N/A
N/A
00111100 at +60 ° C
00000000
10000000
00000000
11111111
00000001
11111111
00000000
01001101
00001001
FUNCTION
Read Remote Temperature Low Byte (3MSBs)
Read Remote Temperature High Byte (Sign Bit and First 7 Bits)
Read Status Byte
Read/Write Configuration Byte
Read/Write Fan-Conversion Rate Byte
Read/Write Remote T MAX
Read/Write Remote T HYST
Read/Write Remote T HIGH
Read/Write Remote T LOW
Write Software POR
Write One-Shot Temperature Conversion
Read/Write Fan-Control Threshold Temperature T FAN
Read/Write Fan-Speed Control
Read/Write Fan Gain
Read Fan Tachometer Count
Read/Write Fan Tachometer Count Limit (Fan Failure Limit)
Read/Write Fan Count Divisor
Read/Write Full-Scale Register
Read/Write Mode Register
Read Manufacturer ID Code
Read Device ID Code
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 CC and clears the memory if V CC
falls below 1.91V (typ, see Electrical Characteristics ).
When power is first applied and V CC rises above 2.0V
(typ), the logic blocks begin operating, although reads
and writes at V CC levels below 3.0V are not recom-
mended. A second V CC comparator, the ADC under-
voltage lockout (UVLO) comparator prevents the ADC
from converting until there is sufficient headroom (V CC
= 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.
12
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