Texas Instruments System-Side Impedance Track(TM) Fuel Gauge bq27500 Manual De Usuario
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3.9
DATA FLASH MEMORY CHARACTERISTICS
3.10
I
2
C-COMPATIBLE INTERFACE COMMUNICATION TIMING CHARACTERISTICS
bq27500
bq27501
System-Side Impedance Track™ Fuel Gauge
bq27501
System-Side Impedance Track™ Fuel Gauge
SLUS785 – SEPTEMBER 2007
ADC (TEMPERATURE AND CELL MEASUREMENT) CHARACTERISTICS (continued)
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
t
ADC_CONV
Conversion time
125
ms
Resolution
14
15
bits
V
ADC_OS
Input offset
1
mV
Z
ADC1
Effective input resistance (TS, RID
8
M
Ω
[bq27501 only])
bq27500/1 not measuring cell voltage
8
M
Ω
Z
ADC2
Effective input resistance (BAT)
(1)
bq27500/1 measuging cell voltage
100
k
Ω
I
ADC_LKG
Input Leakage Current
(1)
0.3
μ
A
(1)
Specified by design. Not tested in production.
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
t
ON
Data retention
See
(1)
10
(1)
Years
Flash programming write-cycles
See
(1)
20,000
Cycles
t
WORDPROG
Word programming time
See
(1)
2
ms
I
CCPROG
Flash-write supply current
5
10
mA
(1)
Specified by design. Not production tested
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
t
r
SCL/SDA rise time
1
μ
s
t
f
SCL/SDA fall time
300
ns
t
w(H)
SCL pulse width (high)
4
μ
s
t
w(L)
SCL pulse width (low)
4.7
μ
s
t
su(STA)
Setup for repeated start
4.7
μ
s
t
d(STA)
Start to first falling edge of SCL
4
μ
s
t
su(DAT)
Data setup time
250
ns
Receive mode
0
t
h(DAT)
Data hold time
ns
Transmit mode
300
t
su(STOP)
Setup time for stop
4
μ
s
t
BUF
Bus free time between stop and start
4.7
μ
s
f
SCL
Clock frequency
10
100
kHz
t
BUSERR
Bus error timeout
17.3
21.2
s
ELECTRICAL SPECIFICATIONS
6