Datasheet

LTC2978A
29
2978afa
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Data Formats
L11 Linear_5s_11s PMBus data field b[15:0]
Value = Y • 2
N
where N = b[15:11] is a 5-bit two’s complement integer and Y = b[10:0] is an 11-bit two’s complement integer
Example:
READ_VIN = 10V
For b[15:0] = 0xD280 = 1101_0010_1000_0000b
Value = 640 • 2
–6
= 10
See PMBus Spec Part II: Paragraph 7.1
L16
Linear_16u PMBus data field b[15:0]
Value = Y • 2
N
where Y = b[15:0] is an unsigned integer and N = Vout_mode_parameter is a 5-bit two’s complement
exponent that is hardwired to –13 decimal.
Example:
VOUT_COMMAND = 4.75V
For b[15:0] = 0x9800 = 1001_1000_0000_0000b
Value = 38912 • 2
–13
= 4.75
See PMBus Spec Part II: Paragraph 8.3.1
Reg Register PMBus data field b[15:0] or b[7:0].
Bit field meaning is defined in detailed PMBus Command Register Description.
CF
Custom Format
PMBus data field b[15:0]
Value is defined in detailed PMBus Command Register Description. This is often an unsigned or two’s complement
integer scaled by an MFR specific constant.
PMBus COMMAND SUMMARY