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參數(shù)資料
| 型號(hào)： | MAX6678AEP92+ |
| 廠商： | Maxim Integrated |
| 文件頁數(shù)： | 14/19頁 |
| 文件大?。?/td> | 669K |
| 描述： | IC TEMP MONITOR 2CH PWM 20-QSOP |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 功能： | 溫度監(jiān)控器 |
| 傳感器類型： | 內(nèi)部和外部 |
| 精確度： | ±4°C（最小值） |
| 輸出類型： | SMBus? |
| 輸出警報(bào)： | 是 |
| 輸出風(fēng)扇： | 是 |
| 電源電壓： | 3 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 20-SSOP（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 20-QSOP |
| 包裝： | 管件 |
Fan Configuration (11h)
The fan-configuration register controls the hysteresis
level, temperature step size, and whether the remote or
local diode controls the PWMOUT2 signal (see Table
2). Set bit D7 of the fan-configuration register to zero to
set the hysteresis value to 5癈. Set bit D7 to 1 to set the
hysteresis value to 10癈. Set bit D6 to zero to set the
fan-control temperature step size to 1癈. Set bit D6 to 1
to set the fan-control temperature step size to +2癈.
Bits D5 to D2 select which PWMOUT_ channel 1 or
channel 2 controls (see Table 2). If both are selected
for a given PWMOUT_, the highest PWM value is used.
If neither is selected, the fan is controlled by the value
written to the fan-target duty-cycle register. Also in this
mode, the value written to the target duty-cycle register
is not limited by the value in the maximum duty-cycle
register. It is, however, clipped to 240 if a value above
240 is written. The POR state of the fan-configuration
register is 00h.
Duty-Cycle Rate of Change (12h)
Bits D7, D6, and D5 (channel 1) and D4, D3, and D2
(channel 2) of the duty-cycle rate-of-change register set
the time between increments of the duty cycle. Each
increment is 2/240 of the duty cycle (see Table 4). This
allows the time from 33% to 100% duty cycle to be adjust-
ed from 5s to 320s. The rate-of-change control is always
active in manual mode. To make instant changes, set bits
D7, D6, and D5 (channel 1) or D4, D3, and D2 (channel
2) = 000. The POR state of the duty-cycle rate-of-change
register is B4h (1s between increments).
Duty-Cycle Step Size (13h)
Bits D7D4 (channel 1) and bits D3D0 (channel 2) of the
duty-cycle step-size register change the size of the duty-
cycle change for each temperature step. The POR state
of the duty-cycle step size register is 55h (see Table 5).
PWM Frequency Select (14h)
Set bits D7, D6, and D5 (select A, B, and C) in the PWM
frequency-select register to control the PWMOUT frequen-
cy (see Table 6). The POR state of the PWM frequency-
select register is 40h, 33Hz. The lower frequencies are
usually used when driving the fans power-supply pin as
in the Typical Application Circuit, with 33Hz being the
most common choice. The 35kHz frequency setting is
used for controlling fans that have logic-level PWM input
pins for speed control. The minimum duty-cycle resolution
is decreased from 2/240 to 4/240 at the 35kHz frequen-
cy setting. For example, a result that would return a value
of 6/240 is truncated to 4/240.
2-Channel Temperature Monitor with Dual Automatic
PWM Fan-Speed Controller and Five GPIOs
14 ______________________________________________________________________________________
Table 4. Setting the Time Between Duty-
Cycle Increments
D7:D5, D4:D2
TIME BETWEEN
INCREMENTS (s)
TIME FROM 33%
TO 100% (s)
000
0
0
001
0.0625
5
010
0.125
10
011
0.25
20
100
0.5
40
101
1
80
110
2
160
111
4
320
Table 5. Setting the Duty-Cycle Change
D7:D4, D3:D0
CHANGE IN DUTY
CYCLE PER
TEMPERATURE
STEP
TEMPERATURE
RANGE FOR FAN
CONTROL
(1?/SPAN>C STEP, 33%
TO 100%)
0000
0
0
0001
2/240
80
0010
4/240
40
0011
6/240
27
0100
8/240
20
0101
10/240
16
&
&
...
1000
16
10
...
...
...
1111
31
5
Table 6. PWM Frequency Select
PWM
FREQUENCY (Hz)
SELECT A SELECT B SELECT C
20
0
0
0
33
0
1
0
50
1
0
0
100
1
1
0
35k
X
X
1
Note: At 35kHz, duty-cycle resolution is decreased from a res-
olution of 2/240 to 4/240.
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| MAX6678AEP92+ | 功能描述:板上安裝溫度傳感器 2Ch Temperature Monitor RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| MAX6678AEP92+T | 功能描述:板上安裝溫度傳感器 2Ch Temperature Monitor RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| MAX6678AEP92-T | 功能描述:板上安裝溫度傳感器 2Ch Temperature Monitor RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| MAX6678AEP94 | 功能描述:板上安裝溫度傳感器 RoHS:否 制造商:Omron Electronics 輸出類型:Digital 配置: 準(zhǔn)確性:+/- 1.5 C, +/- 3 C 溫度閾值: 數(shù)字輸出 - 總線接口:2-Wire, I2C, SMBus 電源電壓-最大:5.5 V 電源電壓-最小:4.5 V 最大工作溫度:+ 50 C 最小工作溫度:0 C 關(guān)閉: 安裝風(fēng)格: 封裝 / 箱體: 設(shè)備功能:Temperature and Humidity Sensor |
| MAX6678AEP94+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
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