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参数资料
| 型号： | MAX6641AUB96+T |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 温度/湿度传感器 |
| 英文描述： | SMBus-Compatible Temperature Monitor with Automatic PWM Fan-Speed Controller |
| 中文描述： | DIGITAL TEMP SENSOR-SERIAL, 8BIT(s), 1Cel, SQUARE, SURFACE MOUNT |
| 封装： | 3 X 3 MM,LEAD FREE, MO-187C-BA, USOP-10 |
| 文件页数： | 15/19页 |
| 文件大小： | 538K |
| 代理商： | MAX6641AUB96+T |
Detailed Description
The MAX6641 temperature sensor and fan controller
accurately measures the temperature of its own die
and the temperature of a remote pn junction. The
device reports temperature values in digital form using
a 2-wire serial interface. The remote pn junction is typi-
cally the emitter-base junction of a common-collector
pnp on a CPU, FPGA, or ASIC. The MAX6641 operates
from supply voltages of 3.0V to 5.5V and consumes
500A of supply current. The temperature data controls
a PWM output signal to adjust the speed of a cooling
fan. The device also features an over-temperature
alarm output to generate interrupts, throttle signals, or
shut down signals.
SMBus Digital Interface
From a software perspective, the MAX6641 appears as
a set of byte-wide registers that contain temperature
data, alarm threshold values, and control bits. A stan-
dard SMBus-compatible 2-wire serial interface is used
to read temperature data and write control bits and
alarm threshold data. These devices respond to the
same SMBus slave address for access to all functions.
The MAX6641 employs four standard SMBus protocols:
write byte, read byte, send byte, and receive byte
(Figures 1, 2, and 3). The shorter receive byte protocol
allows quicker transfers, provided that the correct data
register was previously selected by a read byte instruc-
tion. Use caution when using the shorter protocols in
multimaster systems, as a second master could over-
write the command byte without informing the first mas-
ter. The MAX6641 has four different slave addresses
available; therefore, a maximum of four MAX6641
devices can share the same bus.
Temperature data within the 0°C to +255°C range can
be read from the read external temperature register
(00h). Temperature data within the 0°C to +125°C range
can be read from the read internal temperature register
(01h). The temperature data format for these registers is
8 bits, with the LSB representing +1°C (Table 1) and the
MSB representing +128°C. The MSB is transmitted first.
All values below 0°C are clipped to 00h.
Table 1 details the register address and function,
whether they can be read or written to, and the power-on
reset (POR) state. See Tables 1–5 for all other register
functions and the Register Descriptions section. Figure 4
is the MAX6641 block diagram.
MAX6641
SMBus-Compatible Temperature Monitor with
Automatic PWM Fan-Speed Controller
_______________________________________________________________________________________
5
PIN
NAME
FUNCTION
1, 6
I.C.
Internally Connected. Must be connected to GND.
2DXN
Combined Remote-Diode Cathode Connection and A/D Negative Input. Connect the cathode of the
remote-diode-connected transistor to DXN.
3
DXP
Combined Remote-Diode Current Source and A/D Positive Input for Remote-Diode Channel. Connect
DXP to the anode of a remote-diode-connected temperature-sensing transistor. DO NOT LEAVE
DXP FLOATING; connect to DXN if no remote diode is used. Place a 2200pF capacitor between DXP
and DXN for noise filtering.
4
GND
Ground
5
OT
Active-Low, Open-Drain, Over-Temperature Output. Use OT as an interrupt, a system shutdown
signal, or to control clock throttling. OT can be pulled up to 5.5V, regardless of the voltage on VCC.
OT is high impedance when VCC = 0.
7
SMBCLK
SMBus Serial-Clock Input. SMBCLK can be pulled up to 5.5V, regardless of VCC. Open drain.
SMBCLK is high impedance when VCC = 0.
8
SMBDATA
SMBus Serial-Data Input/Output. SMBDATA can be pulled up to 5.5V, regardless of VCC. Open drain.
SMBDATA is high impedance when VCC = 0.
9VCC
Positive Supply. Bypass with a 0.1F capacitor to GND.
10
PWMOUT
PWM Output to Fan Power Transistor. Connect PWMOUT to the gate of a MOSFET or the base of a
bipolar transistor to drive the fan’s power supply with a PWM waveform. Alternatively, the PWM output
can be connected to the PWM input of a fan with direct speed-control capability, or it can be
converted to a DC voltage for driving the fan’s power supply. PWMOUT requires a pullup resistor. The
pullup resistor can be connected to a voltage supply up to 5.5V, regardless of VCC.
Pin Description
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相关代理商/技术参数 |
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|---|---|
| MAX6642ATT90 | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX6642ATT90+ | 制造商:Maxim Integrated Products 功能描述:TEMP SENSOR DGTL 2-WIRE 6TDFN EP - Rail/Tube |
| MAX6642ATT90+T | 功能描述:板上安装温度传感器 SMBus-Compatible Temperature Sensor RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
| MAX6642ATT90T | 制造商:Maxim Integrated Products 功能描述: |
| MAX6642ATT90-T | 功能描述:板上安装温度传感器 RoHS:否 制造商:Omron Electronics 输出类型:Digital 配置: 准确性:+/- 1.5 C, +/- 3 C 温度阈值: 数字输出 - 总线接口:2-Wire, I2C, SMBus 电源电压-最大:5.5 V 电源电压-最小:4.5 V 最大工作温度:+ 50 C 最小工作温度:0 C 关闭: 安装风格: 封装 / 箱体: 设备功能:Temperature and Humidity Sensor |
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