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參數(shù)資料
| 型號(hào)： | MAX6650 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Fan-Speed Regulators and Monitors with SMBus/I2C-Compatible Interface |
| 中文描述： | 風(fēng)扇轉(zhuǎn)速調(diào)節(jié)器和監(jiān)控器，帶有SMBus™/I²C兼容接口 |
| 文件頁(yè)數(shù)： | 12/25頁(yè) |
| 文件大?。?/td> | 315K |
| 代理商： | MAX6650 |
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M
Fan-Speed Regulators and Monitors
with SMBus/I
2
C-Compatible Interface
12
______________________________________________________________________________________
Table 8. Alarm Status Register Bit Assignments
7 (MSB) to 5
4
3
2
GPIO1
TACH
—
BIT
GPIO2 (MAX6651 only)
0
0
NAME
1
MIN
MAX
0
0
0 (LSB)
0
0
POR
(DEFAULT)
STATE
Always 0
GPIO2 Alarm. Set when GPIO2 is low (MAX6651 only).
Minimum Output Level Alarm
Maximum Output Level Alarm
GPIO1 Alarm. Set when GPIO1 is low.
Tachometer Overflow Alarm
FUNCTION
The first 6 bits of the Tachometer Count-Time Register
are always zero, and the last 2 bits set the count time
(Table 9). The count time may be determined from the
following equation:
t
COUNT
= 0.25s x 2
K
COUNT
where K
COUNT
is the numerical value of the two 2LSBs.
The 0.25 factor has a ±10% uncertainty.
Upon power-up, the Tachometer Count Registers reset
to 00h and the Tachometer Count-Time Register sets a
1s integration time.
Digital-to-Analog Converter
When using the open-loop mode of operation, the DAC
Register sets the voltage on the low side of the fan. An
internal operational amplifier compares the feedback
voltage (V
FB
) with the reference voltage set by the 8-bit
DAC, and adjusts the output voltage (V
OUT
) until the
two input voltages are equal. The voltage at the FB pin
may be determined by the following equation:
V
FB
= (10 x V
REF
x K
DAC
) / 256
and the voltage across the fan is:
where K
DAC
is the numerical value of the DAC Register
and V
REF
= 1.5V. The minimum feedback voltage is
limited by the voltage drop across the external MOS-
FET (R
ON
x I
FAN
), and the maximum voltage is limited
by the fan
’
s supply voltage (V
FAN
). For linear opera-
V
k
k
K
V
FAN
DAC
256
REF
–
90
10
1
+
Table 9. Tachometer Count-Time Register
(Assumes two pulses per revolution)
1 = Alarm condition
Table 7. Alarm-Enable Register Bit Masks
7 (MSB) to 5
4
3
2
GPIO1
TACH
—
BIT
GPIO2 (MAX6651 only)
0
0
NAME
1
MIN
MAX
0
0
0 (LSB)
0
0
POR
(DEFAULT)
STATE
Always 0
GPIO2 Alarm Enable/Disable (MAX6651 only)
Minimum Output Level Alarm Enable/Disable
Maximum Output Level Alarm Enable/Disable
GPIO1 Alarm Enable/Disable
Tachometer Overflow Alarm Enable/Disable
FUNCTION
1 = Enabled
REGISTER
VALUE
(K
COUNT
)
COUNT
TIME
(s)
MAXIMUM
FAN SPEED
(RPS)
MINIMUM
RESOLUTION
(Hz/COUNT)
0000 0000
0000 0001
0000 0010
0000 0011
0.25
0.5
1.0
2.0
512
256
128
64
2
1
0.5
0.25
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