39
Rev. 0
APPENDIX B: CAN BASED EVALUATION
Table 5. CAN Message Received by DC2732A_CAN to Configure Measurements
ID
Name
Signal
T, [Byte], Bits
Description
MEAS_BAT
Bool, [4] (6)
Battery voltage measurement enable flag
MEAS_TEMP
Bool, [4] (7)
IC temperature measurement enable flag
MEAS_VCC
Bool, [5] (0)
IC supply voltage measurement enable flag.
MEAS_VREF
Bool, [5] (1)
Reference voltage (V
REF
pin) measurement enable flag.
Any combination of measurement enable flags may be set to
NTC1_TYPE
Bool, [5] (3:2)
Selects on of 3 predefined NTC parameters.
NTC2_TYPE
Bool, [5] (5:4)
NTCx_TYPE
MPN
A
B
C
R
REF
0
NTCALUG01A104F/TDK
9.85013754e-4
1.95569870e-4
7.69918797e-8
100e3
1
NTHCG143/Murata
8.39126e-4
2.08985e-4
7.13241e-8
100e3
2
Reserved
8.39126e-4
2.08985e-4
7.13241e-8
100e3
For NTCx_TYPE = 3, no configuration of NTC parameters will be written to LTC2949 with the CFG2949 message. This allows user defined
values provided via a RAWRW message.
ACC
Bool, [5] (6)
Battery voltage measurement enable flag. If set the accumulators C1, E1, TB1 are
reported via CAN messages ACC_C1, ACC_E1, ACC_TB1.
MEAS_
ENABLE
Bool, [5] (7)
Global measurements enable. Only if this flag is set DC2732A_CAN will do
measurements and react on FASTRQ.
MEAS_
PERIOD
UInt, [6],8
Measurement period in multiples of 100ms. For example, if set to 10 all enabled
measurement CAN messages will be send every second. If set to zero messages
will be send at the update rate of LTC2949 which is ~100ms. A value of 1 (100ms)
may result in a jitter of the actual send message period as the internal update rate
of LTC2949 may vary and messages will never be sent before LTC2949 updates its
measurement registers. Setting a value of 255 will completely disable reading of slow
channel registers. Fast channel values may still be reported.
FAST_MEAS_
PERIOD
UInt, [7],8
Fast measurement cycle time in milliseconds. If greater than zero, fast measurements
are reported periodically. Same as signal FAST_MEAS_PERIOD of CAN
message FASTRQ.
Notes:
1.“T, [Byte], Bits” indicates the type and number of bits. For example ,“Int, [0], 8” refers to an 8-bit integer value stored in CAN message data byte 0.
2. For Boolean signals the bit index is given in round brackets, for example, “Bool, [4] (7)” refers to a flag stored at bit position 7 within CAN data byte 4.
3. For signals covering only part of a byte the bit range is given in round brackets, for example, “UInt, [3] (7:4)” refers to an unsigned integer value
covering bits [7:4] within CAN data byte 3.