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PDF STC3100 Data sheet ( Hoja de datos )
| Número de pieza | STC3100 | |
| Descripción | Battery monitor IC | |
| Fabricantes | STMicroelectronics | |
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STC3100
Battery monitor IC with Coulomb counter/gas gauge
Features
■ Battery voltage monitoring
■ Internal temperature sensor
■ Coulomb counter with 12/14-bit AD converter,
+/- 80 mV input voltage range
■ Internal or external 32768 Hz time base
■ I2C interface for gas gauge monitoring and
device control
■ 32-RAM bytes
■ 8-byte unique device ID
■ One general-purpose I/O
Applications
■ Cellular phones, PDA, MP3 players, cordless
phones
■ Digital cameras, USB appliances, Bluetooth
devices
Description
The STC3100 monitors the critical parameters of
a single-cell Li-Ion battery (voltage, temperature
and current) and includes hardware functions to
implement a gas gauge for battery charge
monitoring, based on a programmable 12- to
14-bit A/D converter. With a typical 30 milliOhms
external sense resistor, the battery current can be
up to 2.5 A and the accumulator system provides
a capacity up to +/-7000 mAh with a resolution of
0.2 mAh.
The device is programmable through the I2C
interface.
MiniSO-8
(Plastic micropackage)
DFN8 3x3
(Plastic micropackage)
Pin connections
(top view)
IO0
ROSC
SDA
SCL
1
2
3
4
8 VIN
7 VCC
6 CG
5 GND
January 2009
Rev 1
1/21
www.st.com
21
1 page  
STC3100
4 Electrical characteristics
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Table 4. Electrical characteristics (2.7 V < VCC < 4.5 V, -20° C to 70° C)
Symbol
Parameter
Conditions
Min Typ Max Units
Supply
ICC
Istby
Operating current consumption
Current consumption in standby
Average value over 4s
standby mode, inputs=0V
100 uA
2 uA
Ipdn
UVLOth
UVLOhyst
Current consumption in power down
Undervoltage threshold
Undervoltage threshold hysteresis
VCC < UVLOth, inputs=0V
1 uA
(VCC decreasing)
2.5 2.6 2.7 V
100 mV
POR
Power-on reset threshold
Gas gauge A/D converter
(VCC decreasing)
2.0 V
Vin_gg
Input voltage range
-80 +80 mV
Iin Input current for CG pin
500 nA
ADC_res
AD converter granularity
12 bits
13 bits
14 bits
47.08
23.54
11.77
uV
uV
uV
ADC_offset AD converter offset
CG = 0V
12 bits
13 bits
14 bits
-2 2 LSB
-2 2 LSB
-3 3 LSB
ADC_time
ADC_acc
Fosc
Osc_acc
AD conversion time (32768Hz clock)
12 bits
13 bits
14 bits
AD converter gain accuracy at full scale
25° C
over temperature range
Internal time base frequency
Rosc = 200 kΩ, 0.1%
Internal time base accuracy
25° C, VCC = 3.6 V
over temperature and
voltage ranges
125
250
500
0.5
1
32768
2
2.5
ms
ms
ms
%
%
Hz
%
%
Fosc_ext
External time base frequency range
30 70 kHz
Cur_res
Current register LSB value
11.77
uV
Chg_res
Charge register LSB value
(32,768 Hz clock)
=Cur_res*2^12*0.5/3600
6.70 uV.h
Global_
CG_acc
Gas gauge accuracy (not including the Using internal time base
external sense resistor tolerance)
Using external time base
3.5 %
1%
5/21
5 Page 
STC3100
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7.5 Unique device ID
The STC3100 provides a means to identify the battery pack or the subsystem. Each device
has its own unique 8-byte ID made of an 8-bit part ID (value = 10h for the STC3100), a
48-bit random unique ID and an 8-bit CRC.
The CRC-8 is calculated according to bytes REG_ID0 to REG_ID6 using the "x8 + x2 + x +
1" polynomial with a zero initial value.
Since the device ID is downloaded from the ROM at power-up and is subsequently kept in
read-only RAM locations together with the general-purpose RAM registers, the device ID
can also be used as an indicator of the RAM integrity.
11/21
11 Page | ||
| Páginas | Total 21 Páginas | |
| PDF Descargar | [ Datasheet STC3100.PDF ] | |
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