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LTC2949 Datasheet(PDF) 39 Page - Analog Devices

Part # LTC2949
Description  Current, Voltage, and Charge Monitor for High Voltage Battery Packs
PDF  80 Pages
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LTC2949 Datasheet(HTML) 39 Page - Analog Devices

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LTC2949
39
Rev A
For more information www.analog.com
SERIAL INTERFACES
Table 21. PEC Calculation for 0x0001
PEC[14]
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
0
0
0
PEC[13]
0
0
0
0
0
0
0
0
0
1
0
0
0
0
1
1
0
0
PEC[12]
0
0
0
0
0
0
0
0
1
0
0
0
0
1
1
0
1
1
PEC[11]
0
0
0
0
0
0
0
1
0
0
0
0
1
1
0
1
1
1
PEC[10]
0
0
0
0
0
0
1
0
0
0
0
1
1
0
1
1
1
1
PEC[9]
0
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
1
1
PEC[8]
0
0
0
0
1
0
0
0
0
0
0
1
0
0
0
1
0
0
PEC[7]
0
0
0
1
0
0
0
0
0
0
0
1
1
1
0
1
1
1
PEC[6]
0
0
1
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
PEC[5]
0
1
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
1
PEC[4]
1
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
1
1
PEC[3]
0
0
0
0
0
0
0
0
0
0
0
1
1
1
0
0
0
0
PEC[2]
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
PEC[1]
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
PEC[0]
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
IN14
0
0
0
0
0
0
0
0
0
1
1
1
1
1
0
0
0
IN10
0
0
0
0
0
1
0
0
0
0
1
1
0
1
1
1
PEC Word
IN8
0
0
0
1
0
0
0
0
0
0
1
0
0
0
1
0
IN7
0
0
1
0
0
0
0
0
0
0
1
1
1
0
1
1
IN4
0
0
0
0
0
0
0
0
0
0
1
0
0
0
1
1
IN3
0
0
0
0
0
0
0
0
0
0
1
1
1
0
0
0
IN0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
DIN
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
Clock Cycle
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Table 22. Write/Read PEC Format
NAME
RD/WR
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
PEC0
RD/WR
PEC[14]
PEC[13]
PEC[12]
PEC[11]
PEC[10]
PEC[9]
PEC[8]
PEC[7]
PEC1
RD/WR
PEC[6]
PEC[5]
PEC[4]
PEC[3]
PEC[2]
PEC[1]
PEC[0]
0
Improved PEC Calculation
The PEC allows the user to have confidence that the serial
data read from the LTC2949 is valid and has not been cor-
ruptedbyanyexternalnoisesource.Thisisacriticalfeature
for reliable communication and the LTC2949 requires that
a PEC be calculated for all data being read from and written
to the LTC2949. For this reason it is important to have an
efficient method for calculating the PEC. The code below
demonstrates a simple implementation of a lookup table
derived PEC calculation method. There are two functions,
the first function init_PEC15_Table() should only be called
once when the microcontroller starts and will initialize a
PEC15 table array called pec15Table[]. This table will be
used in all future PEC calculations. The pec15 table can
also be hard coded into the microcontroller rather than
running the init_PEC15_Table() function at startup. The
pec15() function calculates the PEC and will return the
correct 15-bit PEC for byte arrays of any given length.



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