7.9 NTC Thermistor Measurement Support
Unless otherwise noted, characteristics noted under conditions of T
A
= –40℃ to 85℃
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
R
NTRC(PU)
Internal pullup resistance 14.4 18 21.6
kΩ
R
NTC(DRIFT)
Resistance drift over
temperature
–250 –120
0 PPM/°C
7.10 Coulomb Counter (CC)
Unless otherwise noted, characteristics noted under conditions of T
A
= –40℃ to 85℃
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
(CC_IN)
Input voltage range
–0.1
0.1 V
t
(CC_CONV)
Conversion time Single conversion 1000 ms
Effective resolution 1 LSB 3.8 µV
Integral nonlinearity
16-bit, best fit over input voltage
range
–22.3
5.2 +22.3 LSB
Differential nonlinearity 16-bit, no missing codes 1.5 LSB
Offset error 16- bit post calibration
–2.6
1.3 +2.6 LSB
Offset error drift 15-bit + sign, post calibration 0.04 0.07 LSB/°C
Gain error 15-bit + sign, over input voltage range
–492
131 +492 LSB
Gain error drift 15-bit + sign, over input voltage range 4.3 9.8 LSB/°C
Effective input resistance 7
MΩ
7.11 Analog Digital Converter (ADC)
Unless otherwise noted, characteristics noted under conditions of T
A
= –40℃ to 85℃
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
ADC_TS_GPIO
Input voltage range
V
FS
= V
REF2
–0.2
1.0 V
V
FS
= V
REG18
× 2
–0.2
1.44 V
V
BAT_MODE
Battery input voltage
–0.2
5.5 V
Integral nonlinearity
16-bit, best fit, –0.1 V to 0.8 × V
REF2
–8.4
+8.4 LSB
Differential nonlinearity 16-bit, no missing codes 1.5 LSB
Offset error 16-bit post calibration
(1)
, V
FS
= V
REF2
–4.2
1.8 +4.2 LSB
Offset error drift 16-bit post calibration
(1)
, V
FS
= V
REF2
0.02 0.1 LSB/°C
Gain Error
16-bit, –0.1 to 0.8 × V
FS
–492
131 +492 LSB
Gain error drift
16-bit, –0.1 to 0.8 × V
FS
2 4.5 LSB/°C
Effective input resistance 8
MΩ
t
(ADC_CONV)
Conversion time 11.7 ms
Effective resolution 14 15 bits
(1) Factory calibration
7.12 Internal Oscillator Specifications
Unless otherwise noted, characteristics noted under conditions of T
A
= –40℃ to 85℃
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
High Frequency Oscillator (HFO)
f
HFO
Operating frequency 16.78 MHz
f
HFO
HFO frequency drift
TA = –20°C to 70°C –2.5%
2.5%
TA = –40°C to 85°C –3.5
3.5
BQ27Z561-R2
ZHCSKS9A – FEBRUARY 2020 – REVISED NOVEMBER 2021
www.ti.com.cn
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