收藏本站
FPS1000 Instruction Manual
7.4.3 Analog functions
Analog functions are provided by a single PCF8591, 4-channel 8-bit A/D converter. When this device is read by the
serial buscontroller it provides an 8-bit word with the following information:
Channel 1: Output voltage, channel 2: Output current, channel 3: Internal temperature.
The PCF8591 slave address is:
Bit 7 6
Value 1 0
5
0
4
1
3
A2
2
A1
1
A0
0
R/W
The PCF8591 device initially requires a control byte to be written to the configuration register.
The control byte is as follows:
Bit
Value
7
0
6
A
5
0
4
0
3
0
2
B
1
C
0
D
When a single channel is to be read, A,B,C and D should be determined as follows:
A/D channel
Voltage
Current
Temperature
A
0
0
0
B
0
0
0
C
0
0
1
D
0
1
0
To read all channels with a single control byte, A and B have to be "1", C and D have to be "0". This control byte
sets the device so that on each successive read the data from the next A/D is read.Thus, the first result from a
sequence of reads should not be considered.
Note that on each read, a conversion is started for a particular channel and the result will be read from the previous channel.
7.4.4 A/D Scaling
The A/D readback has to be scaled to obtain a correct value for the voltage, current and the temperature. Note that
the voltage reading is made inside the power supply unit before the "Oring" diode and is typically 0.5V higher than
the actual output voltage.
The following scaling should be employed:
VALUE = BYTE VALUE x RESOLUTION
Refer to the following table for the scaling of the A/D channels:
FPS1000-12/S
0~15V
0~80A
0.0586 V/Bit
0.312 A/Bit
FPS1000-24/S
0~100 ° C 0.391 ° C/Bit
FPS1000-32/S
FPS1000-48/S
The measurement range is from 0 to the maximum value listed in the range column. The resolution or scale of
reading is linear over the entire range and provides a linear output on the A/D converter.
7.5 Measurements and calculation examples
7.5.1 Output voltage readback
The voltage before the "Oring" diode is measured and can be read from the A/D converter. This voltage is higher
than the voltage at the output terminals by 0.5V typically.
Model: FPS 1000-48/S
1. Output voltage (at the output terminals): 48.0V
2. Voltage before the "Oring" diode: 48.0V+0.5V=48.5V
3. .Hex readback: CE (1100 1110).
4. Convert the hex readback to decimal: 206
5. Calculate measured Vout: Vout=206*0.2344=48.286V
7.5.2 Output current readback
The output current is sensed by an internal shunt and measured by an A/D converter. Refer to the following examplefor
current readback calculation.
1. Actual output current: 21.0A
2. Hex readback: E0 (1110 0000).
3. Convert the hex readback to decimal: 224
4. Calculate measured Iout: Iout=224*0.0977=21.884A.
21
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
FPXLF0368-20 CRYSTAL 3.6864 MHZ 20PF SMD
FQ3225B-27 CRYSTAL 27.000 MHZ 20PF SMT
FQ5032B-18.432 CRYSTAL 18.432 MHZ 20PF SMD
FQ7050B-7.3728 CRYSTAL 7.3728 MHZ 20PF SMD
FRJ2411 CONN MOD JACK DUST CAP GREY
FRL91-23CGA3-BB79 SWITCH ROCKER DPDT 20A 12V
FRN91-27BB SWITCH ROCKER DPDT 20A 12V
FSM100 SWITCH TACTILE SPST-NO 0.05A 12V
相关代理商/技术参数
FPS100032/P 功能描述:线性和开关式电源 1000W 32V 31A RoHS:否 制造商:TDK-Lambda 产品:Switching Supplies 开放式框架/封闭式:Enclosed 输出功率额定值:800 W 输入电压:85 VAC to 265 VAC 输出端数量:1 输出电压（通道 1）:20 V 输出电流（通道 1）:40 A 商用/医用: 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:Rack 长度: 宽度: 高度:
FPS100032/S 制造商:TDK-Lambda Corporation 功能描述:Power Supply, 992 Watts 制造商:TDK-Lambda Corporation 功能描述:1008W,85-265VAC,32V@40A,1.61" X 5" X 11.4" - Bulk
FPS100048 功能描述:线性和开关式电源 1000W 48V 21A Rear AC Input RoHS:否 制造商:TDK-Lambda 产品:Switching Supplies 开放式框架/封闭式:Enclosed 输出功率额定值:800 W 输入电压:85 VAC to 265 VAC 输出端数量:1 输出电压（通道 1）:20 V 输出电流（通道 1）:40 A 商用/医用: 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:Rack 长度: 宽度: 高度:
FPS1000-48 制造商:TDK 功能描述:
FPS100048/P 功能描述:线性和开关式电源 1000W 48V 21A RoHS:否 制造商:TDK-Lambda 产品:Switching Supplies 开放式框架/封闭式:Enclosed 输出功率额定值:800 W 输入电压:85 VAC to 265 VAC 输出端数量:1 输出电压（通道 1）:20 V 输出电流（通道 1）:40 A 商用/医用: 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:Rack 长度: 宽度: 高度:
FPS100048/P-HFP 制造商:TDK-Lambda Corporation 功能描述:1008W,85-265VAC,48V@21A,1.61" X 5" X 11.4", HAZMAT - Bulk
FPS100048/PS 功能描述:线性和开关式电源 1000W 48V 21A RoHS:否 制造商:TDK-Lambda 产品:Switching Supplies 开放式框架/封闭式:Enclosed 输出功率额定值:800 W 输入电压:85 VAC to 265 VAC 输出端数量:1 输出电压（通道 1）:20 V 输出电流（通道 1）:40 A 商用/医用: 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:Rack 长度: 宽度: 高度:
FPS100048/PS-HFP 制造商:TDK-Lambda Corporation 功能描述:1008W,85-265VAC,48V@21A,1.61" X 5" X 11.4", HAZMAT - Bulk