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参数资料
| 型号： | DS1780E+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 11/28页 |
| 文件大小： | 0K |
| 描述： | IC CPU PERIPHERAL MON 24-TSSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 62 |
| 功能： | 温度监控器，CPU 外围设备 |
| 传感器类型： | 内部 |
| 感应温度： | -40°C ~ 125°C |
| 精确度： | ±12°C（最小值） |
| 拓扑： | ADC（三角积分型），比较器，风扇速度控制，寄存器库 |
| 输出类型： | I²C?/SMBus? |
| 输出警报： | 无 |
| 输出风扇： | 是 |
| 电源电压： | 2.8 V ~ 5.75 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-TSSOP（0.173"，4.40mm 宽） |
| 供应商设备封装： | 24-TSSOP |
| 包装： | 管件 |
| 产品目录页面： | 1436 (CN2011-ZH PDF) |
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DS1780
maximum possible input up to V DD for best noise immunity. Alternatively, use a shunt reference or Zener
diode to clamp the input level.
Tables 7 and 8 describe the format of the data stored in the FAN reading registers (Internal Address
Registers 28h and 29h).
FAN TACHOMETER INPUT OPTIONS Figure 3
VOLTAGE/DATA RELATIONSHIPS FOR FAN INPUTS (FAN1, FAN2) UNDER
DEFAULT (÷2) MODE Table 7
RPM
4400
3080
2640
Timer Per Revolution
13.64 ms
19.48 ms
22.73 ms
Counts for “Divide by 2” (default mode) in decimal
153
219
255 (maximum)
Comments
Typical RPM
70% RPM
60% RPM
VOLTAGE/DATA RELATIONSHIPS FOR FAN INPUTS (FAN1, FAN 2) Table 8
MODE
SELECT
Divide by 1
Divide by 2
Divide by 4
Divide by 8
NOMINAL
RPM
8800
4400
2200
1100
TIME PER
REVOLUTION
6.82 ms
13.64 ms
27.27 ms
54.54 ms
COUNTS FOR THE
NOMINAL
SPEED IN DECIMAL
153
153
153
153
70% RPM
6160
3080
1540
770
TIME PER
REVOLUTION FOR
70% RPM
9.74 ms
19.48 ms
38.96 ms
77.92 ms
In general, the value stored in the FAN registers (in decimal) follows the equation:
Count (RPM, Divisor) @
1.35 x 10 6
RPM Divisor
If fans can be powered while the power to the DS1780 is off, the DS1780 inputs will provide diode
clamping. Limit input current to the Input Current at Any Pin specification shown in the ABSOLUTE
MAXIMUM RATINGS section. In most cases, open collector outputs with pullup resistors inherently
limit this current. If this maximum current could be exceeded, either a larger pullup resistor should be
used or resistors connected in series with the fan inputs.
The Fan Inputs gate an internal 22.5 kHz oscillator for one period of the Fan signal into an 8-bit counter
(maximum count = 255). The default divisor, located in the Fan Divisor/RST_Register, is set to 2
(choices are 1, 2, 4, and 8) providing a nominal count of 153 for a 4400 rpm fan with two pulses per
revolution. Typical practice is to consider 70% of normal RPM a fan failure, at which point the count will
be 219.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| DS1780E/T&R | 制造商:Maxim Integrated Products 功能描述:PC HARDWARE MONITOR T&R - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC CPU PERIPHERAL MON 24-TSSOP |
| DS1780E/T&R | 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 |
| DS1780E/TR | 制造商:Maxim Integrated Products 功能描述:Data Acquisition System, 6 Channel, 8 Bit, 24 Pin, Plastic, TSSOP |
| DS1780E+ | 功能描述:板上安装温度传感器 CPU Peripheral Monitor 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 |
| DS1780E+T&R | 制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:TEMP SENSOR DGTL 2-WIRE 24TSSOP - Tape and Reel 制造商:Maxim Integrated Products 功能描述:IC CPU PERIPHERAL MON 24-TSSOP 制造商:Maxim Integrated Products 功能描述:Board Mount Temperature Sensors CPU Peripheral Monitor |
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