参数资料
型号: DS1780E/T&R
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: 1,000
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:
输出风扇:
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: 带卷 (TR)
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.
11 of 28
相关PDF资料
PDF描述
AMC35DRTF CONN EDGECARD 70POS .100 DIP SLD
ASC35DREF CONN EDGECARD 70POS .100 EYELET
RSO-4815S/H2 CONV DC/DC 1W 36-72VIN 15VOUT
HAZ471MBABREKR CAP CER 470PF 1KV 20% RADIAL
AMC35DREF CONN EDGECARD 70POS .100 EYELET
相关代理商/技术参数
参数描述
DS1780K 功能描述:KIT EVALUATION DS1780 RoHS:否 类别:编程器,开发系统 >> 过时/停产零件编号 系列:- 标准包装:1 系列:- 传感器类型:CMOS 成像,彩色(RGB) 传感范围:WVGA 接口:I²C 灵敏度:60 fps 电源电压:5.7 V ~ 6.3 V 嵌入式:否 已供物品:成像器板 已用 IC / 零件:KAC-00401 相关产品:4H2099-ND - SENSOR IMAGE WVGA COLOR 48-PQFP4H2094-ND - SENSOR IMAGE WVGA MONO 48-PQFP
DS17885 制造商:DALLAS 制造商全称:Dallas Semiconductor 功能描述:3V/5V Real-Time Clock
DS17885-3 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube
DS17885-3+ 功能描述:实时时钟 3V/5V RTC RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube
DS17885-5 功能描述:实时时钟 RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube