MAX6653 데이터 시트보기 (PDF) - Maxim Integrated
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MAX6653 Datasheet PDF : 24 Pages
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Temperature Monitors and
PWM Fan Controllers
Table 4. Temperature Data Low Byte Format Structure: LLLXXRRR*
FRACTIONAL TEMPERATURE (°C)
0.000
0.125
0.25
0.375
0.5
0.625
0.75
0.875
DIGITAL OUTPUT (LOCAL)
000X XXXX
001X XXXX
010X XXXX
011X XXXX
100X XXXX
101X XXXX
110X XXXX
111X XXXX
DIGITAL OUTPUT (REMOTE)
XXX XX 000
XXX XX 001
XXX XX 010
XXX XX 011
XXX XX 100
XXX XX 101
XXX XX 110
XXX XX 111
*Where: LLL = local fractional temperature bits, XX = don’t care, RRR = remote fractional temperature bits.
Table 5. Temperature Conversion Rate Setting (Fan Filter Register (23h)—POR = 111)
BIT 4
0
0
0
0
1
1
1
1
BIT 3
0
0
1
1
0
0
1
1
BIT2
0
1
0
1
0
1
0
1
CONVERSION RATE (Hz)
0.0625
0.125
0.25
0.5
1
2
4
4
CONVERSION TIME (s)
16
8
4
2
1
0.5
0.25
0.25
Table 6. Threshold Limit Registers
NAME ADDRESS R/W
LTH
14h
R/W
LTL
15h
R/W
LTHER
16h
R/W
RTH
18h
R/W
RTL
19h
R/W
RTHER
1Ah
R/W
LTSD
1Bh
R/W
MAX6653 POR VALUE
Set by CRIT0 and CRIT1
Set by CRIT0 and CRIT1
Set by CRIT0 and CRIT1
Set by CRIT0 and CRIT1
Set by CRIT0 and CRIT1
Set by CRIT0 and CRIT1
Set by CRIT0 and CRIT1
MAX6663/MAX6664 POR STATE
0011 1100
0000 0000
0100 0110
0101 0000
0000 0000
0110 0100
N/A
DESCRIPTION
Local temp high limit
Local temp low limit
Local temp THERM limit
Remote temp high limit
Remote temp low limit
Remote temp THERM limit
Local temp shutdown limit
(MAX6653 only)
RTSD
1Ch
R/W Set by CRIT0 and CRIT1
N/A
Remote temp shutdown limit
(MAX6653 only)
Temperature Comparison and
Interrupt System
At the end of each conversion cycle, the converted
temperature data are compared to various set-point
thresholds to control the INT, THERM, SDL, and SDR
outputs. All temperature threshold limits are stored in
the threshold limit registers (Table 6) and can be
changed through the SMBus digital interface.
THERM is an active-low thermal-overload output indicat-
ing that the THERM overtemperature set point is exceed-
ed. With the THERM threshold set to an appropriate value,
the THERM output can be used to control clock throttling.
When this pin is pulled low by an external signal, a status
bit (bit 7, status register 2) is set, and the fan speed is
unconditionally forced to full-on speed. The only way to
reset the status bit is to read status register 2. Connect a
10kΩ pullup resistor between THERM and VCC.
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