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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)： | 33/48頁 |
| 文件大?。?/td> | 1658K |
| 代理商： | LM25066APSQE |
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Reading and Writing Telemetry Data
and Warning Thresholds
All measured telemetry data and user programmed warning
thresholds are communicated in 12 bit two’s compliment bi-
nary numbers read/written in 2 byte increments conforming to
the Direct format as described in section 8.3.3 of the PMBus
Power System Management Protocol Specification 1.1 (Part
II). The organization of the bits in the telemetry or warning
word is shown in Table 40, where Bit_11 is the most signifi-
cant bit (MSB) and Bit_0 is the least significant bit (LSB). The
decimal equivalent of all warning and telemetry words are
constrained to be within the range of 0 to 4095, with the ex-
ception of temperature. The decimal equivalent value of the
temperature word ranges from 0 to 65535.
TABLE 40. Telemetry and Warning Word Format
Byte
B7
B6
B5
B4
B3
B2
B1
B0
1
Bit_7
Bit_6
Bit_5
Bit_4
Bit_3
Bit_2
Bit_1
Bit_0
2
0
Bit_11
Bit_10
Bit_9
Bit_8
Conversion from direct format to real world dimensions of
current, voltage, power, and temperature is accomplished by
determining appropriate coefficients as described in section
7.2.1 of the PMBus Power System Management Protocol
Specification 1.1 (Part II). According to this specification, the
host system converts the values received into a reading of
volts, amperes, watts, or other units using the following rela-
tionship:
where:
X:
the calculated "real world" value (volts, amps, watt, etc.)
m:
the slope coefficient
Y:
a two byte two's complement integer received from device
b:
the offset, a two byte two's complement integer
R:
the exponent, a one byte two's complement integer
R is only necessary in systems where m is required to be an
integer (for example, where m may be stored in a register in
an integrated circuit). In those cases, R only needs to be large
enough to yield the desired accuracy.
TABLE 41. Telemetry and Warning Conversion Coefficients
Commands
Condition
Format
Number of
Data Bytes
m
b
R
Units
READ_VIN, READ_AVG_VIN
VIN_OV_WARN_LIMIT
VIN_UV_WARN_LIMIT
DIRECT
2
22070
-1800
-2
V
READ_VOUT, READ_AVG_VOUT
VOUT_UV_WARN_LIMIT
DIRECT
2
22070
-1800
-2
V
READ_VAUX
DIRECT
2
3546
-3
0
V
*READ_IIN, READ_AVG_IIN
MFR_IIN_OC_WARN_LIMIT
CL = GND
DIRECT
2
13661
-5200
-2
A
*READ_IN, READ_AVG_IN
MFR_IIN_OC_WARN_LIMIT
CL = VDD
DIRECT
2
6852
-3100
-2
A
*READ_PIN, READ_AVG_PIN,
READ_PIN_PEAK
MFR_PIN_OP_WARN_LIMIT
CL = GND
DIRECT
2
736
-3300
-2
W
*READ_PIN, READ_AVG_PIN,
READ_PIN_PEAK
MFR_PIN_OP_WARN_LIMIT
CL = VDD
DIRECT
2
369
-1900
-2
W
READ_TEMPERATURE_1
OT_WARN_LIMIT
OT_FAULT_LIMIT
DIRECT
2
16000
0
-3
°C
* The coefficients relating to current/power measurements and warning thresholds shown in Table 41 are normalized to a sense resistor (R
S) value of 1m. In
general, the current/power coefficients can be calculated using the relationships shown in Table 42.
39
www.national.com
LM25066A
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