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參數(shù)資料
| 型號： | LM25066APSQE |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY SUPPORT CKT, QCC24 |
| 封裝： | LLP-24 |
| 文件頁數(shù)： | 35/48頁 |
| 文件大?。?/td> | 1658K |
| 代理商： | LM25066APSQE |
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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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