ltc6803g-4 Linear Technology Corporation, ltc6803g-4 Datasheet - Page 25

• Manufacturer Part Number: ltc6803g-4
• Description: Ltc6803-2/ltc6803-4 - Multicell Battery Stack Monitor
• Manufacturer: Linear Technology Corporation

OPERATION
Table 16. Memory Bit Descriptions
NAME
CDC
CELL10
LVLPL
GPIO1
GPIO2
WDT
DCCx
V
V
MCxI
CxV
CxUV
CxOV
ETMPx
THSD
REV
ITMP
PEC
REF
*Voltage equations use the decimal value of the registers, 0 to 4095 for 12-bit and 0 to 255 for 8-bit registers
UV
OV
DESCRIPTION
Comparator Duty Cycle
10-Cell Mode
Level Polling Mode
GPIO1 Pin Control
GPIO2 Pin Control
Watchdog Timer
Discharge Cell x
Undervoltage Comparison Voltage*
Overvoltage Comparison Voltage*
Mask Cell x Interrupts
Cell x Voltage*
Cell x Undervoltage Flag
Cell x Overvoltage Flag
External Temperature Measurement*
Thermal Shutdown Status
Revision Code
Internal Temperature Measurement*
Packet Error Code
Reference Voltage for Diagnostics
VALUES
0 = 12-cell mode (default); 1 = 10-cell mode
0 = toggle polling (default); 1 = level polling
Write: 0 = GPIO1 pin pull-down on; 1 = GPIO1 pin pull-down off (default)
Read: 0 = GPIO1 pin at logic ‘0’; 1 = GPIO1 pin at logic ‘1’
Write: 0 = GPIO2 pin pull-down on; 1 = GPIO2 pin pull-down off (default)
Read: 0 = GPIO2 pin at logic ‘0’; 1 = GPIO2 pin at logic ‘1’
Read: 0 = WDTB pin at logic ‘0’; 1 = WDTB pin at logic ‘1’
x = 1..12 0 = turn off shorting switch for cell ‘x’ (default); 1 = turn on shorting switch
Comparison voltage = (V
Comparison voltage = (V
x = 1..12 0 = enable interrupts for cell ‘x’ (default)
x = 1..12 12-bit ADC measurement value for cell ‘x’
x = 1..12 cell voltage compared to V
x = 1..12 cell voltage compared to V
Temperature measurement voltage = (ETMPx –512) • 1.5mV
0 = thermal shutdown has not occurred; 1 = thermal shutdown has occurred
Status cleared to ‘0’ on read of Thermal Register Group
Device revision code
Temperature measurement voltage = (ITMP –512) • 1.5mV = 8mV • T(°K)
Cyclic redundancy check (CRC) value
This reference voltage = (REF –512) • 1.5mV. Normal range is within 2.1V to 2.9V
(Default)
CDC
0
1
2
3
4
6
7
5
1 = turn off interrupts and clear flags for cell ‘x’
cell voltage for cell ‘x’ = (CxV –512) • 1.5mV
reads as 0xFFF while A/D conversion in progress
0 = cell ‘x’ not flagged for undervoltage condition; 1 = cell ‘x’ flagged
0 = cell ‘x’ not flagged for overvoltage condition; 1 = cell ‘x’ flagged
UV/OV COMPARATOR
N/A (Comparator Off)
N/A (Comparator Off)
Standby Mode
PERIOD
2000ms
130ms
500ms
130ms
500ms
13ms
UV
OV
–31) • 16 • 1.5mV (Default V
–32) • 16 • 1.5mV (Default V
UV
OV
comparison voltage
comparison voltage
BETWEEN MEASUREMENTS
LTC6803-2/LTC6803-4
V
REF
POWERED DOWN
Yes
Yes
Yes
Yes
No
No
No
No
UV
OV
= 0)
= 0)
MEASUREMENT TIME
CELL VOLTAGE
13ms
13ms
13ms
13ms
21ms
21ms
21ms
N/A
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