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參數(shù)資料
| 型號： | MIC74BQS |
| 廠商： | Micrel Inc |
| 文件頁數(shù)： | 9/18頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC I/O EXPANDER I2C 8B 16QSOP |
| 標(biāo)準(zhǔn)包裝： | 98 |
| 接口： | I²C，SM 總線 |
| 輸入/輸出數(shù)： | 8 |
| 中斷輸出： | 是 |
| 電源電壓： | 2.7 V ~ 3.6 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 16-SSOP（0.154"，3.90mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 16-QSOP |
| 包裝： | 管件 |
Micrel, Inc.
MIC74
October 2006
17
M9999-101006
the fan will be shutdown by the assertion of the /SHDN
output if FAN_SPEED is zero. If FAN_SPEED is
programmed with any nonzero value, the fan will be
driven to its maximum speed for the duration of tSTART
(about 1 second) and then assume the programmed
speed. Note that the circuit in Figure 14 contains an
additional transistor, Q1, as an inverter because the
regulator in this example has an active-high shutdown
input rather than an enable input. Otherwise the circuits
function identically.
Table 3 lists the output voltages corresponding to all the
fan speeds and system states possible with these
circuits. The following equations are used to calculate
the resistor values used in MIC74 fan speed control
circuits. It is assumed here that the regulator’s internal
reference voltage is 1.24V. If the regulator uses a
different reference voltage, that value should be used
instead.
The following equations show how to calculate the
resistor values for the fan controllers. For example, when
the fan speed register contains 011b, which is the 3rd
lowest speed, RF1 and RF0 are parallel to RMIN to give the
equivalence resistor (REQ) value of 545.
REQ = RF1 || RF0 || RMIN
REQ = 1.8k || 3.6k || 1k
REQ = 545
The output voltage is calculated by using:
+
=
EQ
FB
OUT
R
1
1.24V
V
+
=
545
3k
1
1.24V
VOUT
8.06V
VOUT =
FAN_SPEED
Value
Fan Speed
Selected
RFB
RMIN
RF2
RF1
RF0
REQ
VOUT
0000 0000b
power-up
3k
1k
open
1k
4.96V
0000 0000b
fan off
3k
1k
open
1k
0V
0000 0001b
lowest
3k
1k
open
3.6k
783
5.99V
0000 0010b
2
nd lowest
3k
1k
open
1.8k
open
643
7.03V
0000 0011b
3
rd lowest
3k
1k
open
1.8k
3.6k
545
8.06V
0000 0100b
medium
3k
1k
open
500
8.68V
0000 0101b
3
rd highest
3k
1k
open
3.6k
439
9.71V
0000 0110b
2
nd highest
3k
1k
1.8k
open
391
10.75V
0000 0111b
highest
3k
1k
1.8k
3.6k
353
11.78V
Table 3. Fan Speed Selection
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC74BQS TR | 功能描述:IC I/O EXPANDER I2C 8B 16QSOP RoHS:否 類別:集成電路 (IC) >> 接口 - I/O 擴展器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:74 系列:- 接口:I²C，JTAG 輸入/輸出數(shù):9 中斷輸出:無 頻率 - 時鐘:400kHz 電源電壓:2.7 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:20-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:20-TSSOP 包裝:管件 包括:EEPROM |
| MIC74BWM | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC74YQS | 功能描述:接口-I/O擴展器 2-Wire Serial I/O Expander & Fan Controller, QSOP-16 - Lead Free RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
| MIC74YQS TR | 功能描述:接口-I/O擴展器 2-Wire Serial I/O Expander & Fan Controller, QSOP-17 - Lead Free RoHS:否 制造商:NXP Semiconductors 邏輯系列: 輸入/輸出端數(shù)量: 最大工作頻率:100 kHz 工作電源電壓:1.65 V to 5.5 V 工作溫度范圍:- 40 C to + 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:HVQFN-16 封裝:Reel |
| MIC79050 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:Simple Lithium-Ion Battery Charger Preliminary Information |
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