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参数资料
| 型号： | LM25066APSQX |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 电源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, QCC24 |
| 封装： | LLP-24 |
| 文件页数： | 35/48页 |
| 文件大小： | 1658K |
| 代理商： | LM25066APSQX |
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TABLE 42. Current and Power Telemetry and Warning Conversion Coefficients (R
S in m)
Commands
Condition
Format
Number of Data
Bytes
m
b
R
Units
*READ_IIN, READ_AVG_IIN
MFR_IIN_OC_WARN_LIMIT
CL = GND
DIRECT
2
13661 x R
S
-5200
-2
A
*READ_IIN, READ_AVG_IIN
MFR_IIN_OC_WARN_LIMIT
CL = VDD
DIRECT
2
6854 x R
S
-3100
-2
A
*READ_PIN, READ_AVG_PIN,
READ_PIN_PEAK
MFR_PIN_OP_WARN_LIMIT
CL = GND
DIRECT
2
736 x R
S
-3300
-2
W
*READ_PIN, READ_AVG_PIN,
READ_PIN_PEAK
MFR_PIN_OP_WARN_LIMIT
CL = VDD
DIRECT
2
369 x R
S
-1900
-2
W
Care must be taken to adjust the exponent coefficient, R, such
that the value of m remains within the range of -32768 to
+32767. For example, if a 5 m
sense resistor is used, the
correct coefficients for the READ_IIN command with CL =
VDD would be m = 6830, b = -310, R = -1.
A Note on the "b" Coefficient
Since b coefficients represent offset, for simplification b is set
to zero in the following discussions.
Reading Current
The current register actually displays a value equivalent to a
voltage across the user specified sense resistor, R
S. The co-
efficients enable the data output to be converted to amps. The
values shown in the example are based on having the device
programmed for a 25 mV current limit threshold (CL = GND).
In the 25mV range, the LSB value is 7.32 V and the full scale
range is 30.2 mV. In the 46mV range (CL = VDD), the LSB
value is 14.64 V and the full scale range in 60.4 mV.
Step
Example
1. Determine full scale current and shunt value based on 29.98
mV across shunt at full scale. Use either:
or:
Example: 122A application with 250
shunt.
2. Determine m':
3. Determine exponent R necessary to set m' to integer value m: Select R to provide integer value of m:
R = -2
4. Final values
m = 3390
R = -2
b = 0
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LM25066A
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM25066APSQX/NOPB | 功能描述:热插拔功率分布 RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制: 电源电压-最大:7 V 电源电压-最小:- 0.3 V 工作温度范围: 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:MSOP-8 封装:Tube |
| LM25066EVK/NOPB | 功能描述:电源管理IC开发工具 LM25066 EVAL BOARD RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| LM25066IAPSQ/NOPB | 制造商:Texas Instruments 功能描述:IC PWR MGMT/PROT PMBUS 24WQFN 制造商:Texas Instruments 功能描述:System PWR Mgmt & Protection IC |
| LM25066IAPSQE/NOPB | 功能描述:热插拔功率分布 System PWR Mgmt & Protection IC RoHS:否 制造商:Texas Instruments 产品:Controllers & Switches 电流限制:45 mA 电源电压-最大:17 V 电源电压-最小:2.9 V 工作温度范围:- 40 C to + 85 C 功率耗散: 安装风格:SMD/SMT 封装 / 箱体:WQFN-24 封装:Reel |
| LM25066IAPSQX/NOPB | 制造商:Texas Instruments 功能描述:IC PWR MGMT/PROT PMBUS 24WQFN 制造商:Texas Instruments 功能描述:System PWR Mgmt & Protection IC |
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