Datasheet

LTC2974
73
2974fc
For more information www.linear.com/LTC2974
pMbus coMManD DescripTion
Table 2. Data Block Contents
DATA BYTE* DESCRIPTION
Number of loops: (238 – 71)/54
= 3.1
*Note that PMBus data byte numbers start at 1 rather than 0.
See Figure 13 Block Read.
The data returned between bytes 71 and 237 of the
previous table is interpreted using Position_last and the
following table. The key to identifying the data located in
byte 71 is to locate the DATA corresponding to POSITION
= Position_last in the next table. Subsequent bytes are
identified by decrementing the value of POSITION. For
example: If Position_last = 8 then the first data returned
in a block read is Status_temperature of page 0 followed
by Read_temperature_1[15:8] of page 0 followed by
Read_temperature_1[7:0] of page 0 and so on. See Table 3.
Table 3. Interpreting Cyclical Loop Data
POSITION D ATA
0 Read_temperature_2[7:0]
1 Read_temperature_2[15:8]
2 Read_vout0[7:0]
3 Read_vout0[15:8]
4 Status_vout0[7:0]
5 Status_mfr_specific0[7:0]
6 Read_temperature_1_0[7:0]
7 Read_temperature_1_0[15:8]
8 Status_temperature0[7:0]
9 Status_iout0[7:0]
10 Read_iout0[7:0]
11 Read_iout0[15:8]
12 Read_pout0[7:0]
13 Read_pout0[15:8]
14 Read_vin[7:0]
15 Read_vin[15:8]
16 Status_input[7:0]
17 0x0
18 Read_vout1[7:0]
POSITION D ATA
19 Read_vout1[15:8]
20 Status_vout1[7:0]
21 Status_mfr_specific1[7:0]
22 Read_temperature_1_1[7:0]
23 Read_temperature_1_1[15:8]
24 Status_temperature1[7:0]
25 Status_iout1[7:0]
26 Read_iout1[7:0]
27 Read_iout1[15:8]
28 Read_pout1[7:0]
29 Read_pout1[15:8]
30 Read_vout2[7:0]
31 Read_vout2[15:8]
32 Status_vout2[7:0]
33 Status_mfr_specific2[7:0]
34 Read_temperature_1_2[7:0]
35 Read_temperature_1_2[15:8]
36 Status_temperature2[7:0]
37 Status_iout2[7:0]
38 Read_iout2[7:0]
39 Read_iout2[15:8]
40 Read_pout2[7:0]
41 Read_pout2[15:8]
42 Read_vout3[7:0]
43 Read_vout3[15:8]
44 Status_vout3[7:0]
45 Status_mfr_specific3[7:0]
46 Read_temperature_1_3[7:0]
47 Read_temperature_1_3[15:8]
48 Status_temperature3[7:0]
49 Status_iout3[7:0]
50 Read_iout3[7:0]
51 Read_iout3[15:8]
52 Read_pout3[7:0]
53 Read_pout3[15:8]
Total Bytes = 54