Datasheet
Not Recommended for New Designs
bq27505
SLUS884–FEBRUARY 2009
www.ti.com
3.3 POWER-ON RESET
T
A
= –40°C to 85°C, typical values at T
A
= 25°C and V
BAT
= 3.6 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
IT+
Positive-going battery voltage input at V
CC
2.09 2.20 2.31 V
V
HYS
Power-on reset hysteresis 45 115 185 mV
3.4 INTERNAL TEMPERATURE SENSOR CHARACTERISTICS
T
A
= –40°C to 85°C, 2.4 V < V
CC
< 2.6 V; typical values at T
A
= 25°C and V
CC
= 2.5 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
G
TEMP
Temperature sensor voltage gain –2 mV/°C
3.5 HIGH-FREQUENCY OSCILLATOR
T
A
= –40°C to 85°C, 2.4 V < V
CC
< 2.6 V; typical values at T
A
= 25°C and V
CC
= 2.5 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
f
OSC
Operating frequency 2.097 MHz
T
A
= 0°C to 60°C –2% 0.38% 2%
f
EIO
Frequency error
(1) (2)
T
A
= –20°C to 70°C –3% 0.38% 3%
T
A
= –40°C to 85°C –4.5% 0.38% 4.5%
t
SXO
Start-up time
(3)
2.5 5 ms
(1) The frequency error is measured from 2.097 MHz.
(2) The frequency drift is included and measured from the trimmed frequency at V
CC
= 2.5 V, T
A
= 25°C.
(3) The start-up time is defined as the time it takes for the oscillator output frequency to be within ±3% of typical oscillator frequency.
3.6 LOW-FREQUENCY OSCILLATOR
T
A
= –40°C to 85°C, 2.4 V < V
CC
< 2.6 V; typical values at T
A
= 25°C and V
CC
= 2.5 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
f
LOSC
Operating frequency 32.768 kHz
T
A
= 0°C to 60°C –1.5% 0.25% 1.5%
f
LEIO
Frequency error
(1) (2)
T
A
= –20°C to 70°C –2.5% 0.25% 2.5%
T
A
= –40°C to 85°C –4% 0.25% 4%
t
LSXO
Start-up time
(3)
500 ms
(1) The frequency drift is included and measured from the trimmed frequency at V
CC
= 2.5 V, T
A
= 25°C.
(2) The frequency error is measured from 32.768 kHz.
(3) The start-up time is defined as the time it takes for the oscillator output frequency to be within ±3% of typical oscillator frequency.
3.7 INTEGRATING ADC (COULOMB COUNTER) CHARACTERISTICS
T
A
= –40°C to 85°C, 2.4 V < V
CC
< 2.6 V; typical values at T
A
= 25°C and V
CC
= 2.5 V (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
V
SR
Input voltage range, V
(SRN)
and V
(SRP)
V
SR
= V
(SRN)
– V
(SRP)
–0.125 0.125 V
t
SR_CONV
Conversion time Single conversion 1 s
Resolution 14 15 bits
V
OS(SR)
Input offset 10 mV
INL Integral nonlinearity error ±0.007 ±0.034 % FSR
Z
IN(SR)
Effective input resistance
(1)
2.5 MΩ
I
lkg(SR)
Input leakage current
(1)
0.3 mA
(1) Specified by design. Not tested in production.
6 ELECTRICAL SPECIFICATIONS Copyright © 2009, Texas Instruments Incorporated
Submit Documentation Feedback
Product Folder Link(s): bq27505