參數(shù)資料
型號(hào)： LM64
廠商： National Semiconductor Corporation
元件分類(lèi)： 溫度/濕度傳感器
英文描述： 【1∑C Remote Diode Temperature Sensor with PWM Fan Control and 5 GPIO’s
中文描述： 【1ΣC遠(yuǎn)程二極管溫度傳感器，PWM風(fēng)扇控制和5個(gè)GPIO的
文件頁(yè)數(shù)： 18/29頁(yè)
文件大?。?/td> 363K
代理商： LM64
2.0 LM64 Registers
(Continued)
2.4 LM64 REGISTER DESCRIPTIONS IN FUNCTIONAL ORDER
Fan Control Registers
Address
Hex
4A
HEX
PWM AND RPM REGISTER
Read/
Write
Bits
POR
Value
Name
Description
4A
R/W
7:6
00
PWM
Program
These bits are unused and always set to 0.
0: the PWM Value (register 4C) and the Lookup Table (50–5F) are
read-only. The PWM value (0 to 100%) is determined by the current
remote diode temperature and the Lookup Table, and can be read from
the PWM value register.
1: the PWM value (register 4C) and the Lookup Table (Register 50–5F)
are read/write enabled. Writing the PWM Value register will set the
PWM output. This is also the state during which the Lookup Table can
be written.
0: the PWM output pin will be 0 V for fan OFF and open for fan ON.
1: the PWM output pin will be open for fan OFF and 0 V for fan ON.
5
1
4
0
PWM
Output
Polarity
PWM Clock
Select
[Reserved]
3
0
if 0, the master PWM clock is 360 kHz
if 1, the master PWM clock is 1.4 kHz.
Always write 0 to this bit.
00: Traditional tach input monitor, false readings when under minimum
detectable RPM.
01: Traditional tach input monitor, FFFF reading when under minimum
detectable RPM.
10: Most accurate readings, FFFF reading when under minimum
detectable RPM.
11: Least effort on programmed PWM of fan, FFFF reading when under
minimum detectable RPM.
Note: If the PWM Clock is 360 kHz, mode 00 is used regardless of the
setting of these two bits.
2
0
1:0
00
Tachometer
Mode
4B
HEX
FAN SPIN-UP CONFIGURATION REGISTER
7:6
4B
R/W
0
Fast
Tachometer
Spin-Up
These bits are unused and always set to 0
If 0, the fan spin-up uses the duty cycle and spin-up time, bits 0–4.
If 1, the LM64 sets the PWM output to 100% until the spin-up times out
(per bits 0–2) or the minimum desired RPM has been reached (per the
Tachometer Setpoint setting) using the tachometer input, whichever
happens first. This bit overrides the PWM Spin-Up Duty Cycle register
(bits 4:3)—PWM output is always 100%.
If PWM Spin-Up Time (bits 2:0) = 000, the Spin-Up cycle is bypassed,
regardless of the state of this bit.
00: Spin-Up cycle bypassed (no Spin-Up), unless Fast Tachometer
Terminated Spin-Up (bit 5) is set.
01: 50%
10: 75%–81% Depends on PWM Frequency. See Applications Notes.
11: 100%
000: Spin-Up cycle bypassed (No Spin-Up)
001: 0.05 seconds
010: 0.1 s
011: 0.2 s
100: 0.4 s
101: 0.8 s
110: 1.6 s
111: 3.2 s
5
1
4:3
11
PWM
Spin-Up
Duty Cycle
2:0
111
PWM
Spin-Up
Time
L
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