LTC6803HG-3#PBF Linear Technology, LTC6803HG-3#PBF Datasheet - Page 26

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LTC6803HG-3#PBF

Manufacturer Part Number
LTC6803HG-3#PBF
Description
Manufacturer
Linear Technology
Type
Battery Monitoringr
Datasheet

Specifications of LTC6803HG-3#PBF

Battery Type
Li-Ion
Operating Supply Voltage (min)
4V
Operating Temp Range
-40C to 125C
Package Type
SSOP
Mounting
Surface Mount
Pin Count
44
Operating Temperature Classification
Automotive
Lead Free Status / RoHS Status
Compliant

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LTC6803-1/LTC6803-3
OPERATION
Read Cell Voltage Registers (12 Cell Mode)
Start Cell Voltage ADC Conversions and Poll Status (Toggle Polling)
Start Cell Voltage ADC Conversions and Poll Status (Broadcast Command with Toggle Polling)
Poll Interrupt Status (Level Polling)
26
1. Pull CSBI low
2. Send RDCV command and PEC
3. Read CVR00 byte of bottom device, then CVR01 (B), CVR02 (B), … CVR17 (B), and then PEC (B)
4. Read CVR00 byte of middle device, then CVR01 (M), CVR02 (M), … CVR17 (M), and then PEC (M)
5. Read CVR00 byte for top device, then CVR01 (T), CVR02 (T), … CVR17 (T), and then PEC (T)
6. Pull CSBI high
Calculation of serial interface time for sequence above:
1. Pull CSBI low
2. Send STCVAD command byte and PEC (all devices in stack start ADC conversions simultaneously)
3. SDO output from bottom device pulled low for approximately 12ms
4. SDO output toggles at 1kHz rate, indicating conversions complete for all devices in daisy chain
5. Pull CSBI high to exit polling
1. Pull CSBI low
2. Send STCVAD command and PEC (all devices in stack start ADC conversions simultaneously)
3. SDO output of all devices in parallel pulled low for approximately 12ms
4. SDO output toggles at 1kHz rate, indicating conversions complete for all devices in the daisy chain
5. Pull CSBI high to exit polling
1. Pull CSBI low
2. Send PLINT command and PEC
3. SDO output from bottom device pulled low if any device has an interrupt condition; otherwise, SDO high
4. Pull CSBI high to exit polling
Number of devices in stack = N
Number of bytes in sequence = B = 2 command byte, and 18 data bytes plus 1 PEC byte per device = 2 + 19 • N
Serial port frequency per bit = F
Time = (1/F) • B • 8 bits/byte = (1/F) • (2 + 19 • N) • 8
Time for 3-cell example above, with 1MHz serial port = (1/1000000) • (2 + 19 • 3) • 8 = 472µs
(n = 1 TO 12)
CSBI
SCKI
SDI
Sn
Figure 8. S Pin Action and SPI Transmission
WRCFG + CFGR + PEC
t
d
Sn, DISCHARGE PIN STATE
t
d
< 2µs IF Sn IS UNLOADED
680313 F08
680313f

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