BQ76PL536-Q1 Datasheet, PDF (14/60 Pages) Texas Instruments – 3 to 6 Series Cell Lithium-Ion Battery Monitor and Secondary Protection IC for EV and HEV Applications

bq76PL536-Q1
SLUSAB1 – MAY 2011
www.ti.com
Vertical Communications Bus (continued)
Typical values stated where T_A = 25ºC and BAT = 20 V, Min/Max values stated where T_A = –40˚C to 105ºC and BAT = 7.2 V
to 27 V (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP ⁽¹⁾
MAX UNIT
t_{HV_SCLK}
Propagation delay, SCLK_H to
SCLK_N
HOST = 0
40
ns
t_{VB_SCLK}
Propagation delay, SCLK_S to
SCLK_N
HOST = 1
30
ns
t_{HV_SCLK}
t_{VB_SCLK}
t_{HV_SDI}
t_{VB_SDI}
t_{HV_CONV}
Propagation delay, CS_H to CS_N
Propagation delay, CS_S to CS_N
Propagation delay, SDI_H to SDI_N
Propagation delay, SDI_S to SDI_N
Propagation delay, CONV_H to
CONV_N
HOST = 0
HOST = 1
HOST = 0
HOST = 1
HOST = 0
40
ns
30
ns
40
ns
30
ns
100
ns
t_{VB_CONV} Propagation delay, CONV_S to
CONV_N
HOST = 1
30
ns
t_{HV_SDO}
Propagation delay, SDO_N to
SDO_H
HOST = 0
10
ns
t_{VB_SDO}
Propagation delay, SDO_N to
SDO_S
HOST = 1
40
ns
t_{HV_DRDY} Propagation delay, DRDY_N to
DRDY_H
HOST = 0
60
ns
t_{VB_DRDY}
Propagation delay, DRDY_N to
DRDY_S
HOST = 1
40
ns
t_{HV_FAULT} Propagation delay, FAULT_N to
FAULT_H
HOST = 0
55
ns
t_{VB_FAULT} Propagation delay, FAULT_N to
FAULT_S
HOST = 1
30
ns
t_{HV_ALERT} Propagation delay, ALERT_N to
ALERT_H
HOST = 0
65
ns
t_{VB_ALERT} Propagation delay, ALERT_N to
ALERT_S
HOST = 1
30
ns
(1) Typical values are quoted in place of MIN/MAX for design guidance only. Actual propagation delay depends heavily on wiring and
capacitance in the signal path. These parameters are not tested in production due to these dependencies on system design
considerations.
ANALOG-TO-DIGITAL CONVERSION (ADC)
General Features
The integrated 14-bit (unsigned) high-speed successive approximation register (SAR) analog-to-digital converter
uses an integrated band-gap reference voltage (V_REF) for the cell and brick measurements. The ADC has a
front-end multiplexer for nine inputs – six cells, two temperature sensors, and one general-purpose analog input
(GPAI). The GPAI input can further be multiplexed to measure the brick voltage between the BATx pin and VC0
or the voltage between the GPAI+ and GPAI– pins.
The ADC and reference are factory trimmed to compensate for gain, offset, and temperature-induced errors for
all inputs. The measurement result is not allowed to roll over due to offset error at the top and bottom of the
range, i.e., a reading near zero does not underflow to 0x03ff due to offset error, and vice-versa.
The converter returns 14 valid unsigned magnitude bits in the following format:
<00xxxxxx xxxxxxxx>
Each word is returned in big-endian format in a register pair consisting of two adjacent 8-bit registers. The MSB
of the word is located in the lower-address register of the pair, i.e., data for cell 1 is returned in registers 0x03
and 0x04 as 00xxxxxx xxxxxxxxb.
14
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