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PDF STC3115 Data sheet ( Hoja de datos )
| Número de pieza | STC3115 | |
| Descripción | Gas gauge IC | |
| Fabricantes | STMicroelectronics | |
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STC3115
Gas gauge IC with alarm output for handheld applications
CSP (1.4 x 2.0 mm)
Features
• OptimGaugeTM algorithm
• 0.25% accuracy battery voltage monitoring
• Coulomb counter and voltage-mode gas gauge
operations
• Robust initial open-circuit-voltage (OCV)
measurement at power up with debounce
delay
• Low battery level alarm output with
programmable thresholds
• Internal temperature sensor
• Battery swap detection
• Low power: 45 µA in power-saving mode, 2 µA
max in standby mode
• 1.4 x 2.0 mm 10-bump CSP package
Applications
• Mobile phones, multimedia players, digital
cameras
• Portable medical equipment
Datasheet - production data
Description
The STC3115 includes the hardware functions
required to implement a low-cost gas gauge for
battery monitoring. The STC3115 uses current
sensing, Coulomb counting and accurate
measurements of the battery voltage to estimate
the state-of-charge (SOC) of the battery. An
internal temperature sensor simplifies
implementation of temperature compensation.
An alarm output signals a low SOC condition and
can also indicate low battery voltage. The alarm
threshold levels are programmable.
The STC3115 offers advanced features to ensure
high performance gas gauging in all application
conditions.
January 2014
This is information on a product in full production.
DocID023755 Rev 4
1/31
www.st.com
1 page  
STC3115
2 Pin assignment
Pin assignment
Table 1. STC3115 pin description
Pin CSP
no. bump
Pin
name
Type(1)
Function
1 A1
2 B1
3 C1
ALM
SDA
SCL
I/OD
I/OD
I_D
Alarm signal output, open drain,
external pull-up with resistor
I2C serial data
I2C serial clock
4 D1
GND
Ground Analog and digital ground
5 D2
NC
- NC
6 D3 CG I_A Current sensing input
Reset sense input & reset control output (open drain)
7 C3 RSTIO/BATD I/OD or
Battery detection input
8
B2
BATD/CD
I/OA
Battery charge inhibit (active high output)
Battery detection (input)
9 B3
VCC
Supply Power supply
10 A3 VIN I_A Battery voltage sensing input
1. I = input, 0 = output, OD = open drain, A = analog, D = digital, NC = not connected
3 Absolute maximum ratings and operating conditions
Symbol
VCCMAX
VIO
TSTG
TJ
ESD
Table 2. Absolute maximum ratings
Parameter
Value
Maximum voltage on VCC pin
Voltage on I/O pins
Storage temperature
Maximum junction temperature
6
-0.3 to 6
-55 to 150
150
Electrostatic discharge (HBM: human body model)
2
Symbol
VCC
VMIN
TOPER
TPERF
Table 3. Operating conditions
Parameter
Operating supply voltage on VCC
Minimum voltage on VCC for RAM content retention
Operating free air temperature range
Value
2.7 to 4.5
2.0
-40 to 85
-20 to 70
DocID023755 Rev 4
Unit
V
°C
kV
Unit
V
°C
5/31
31
5 Page 
STC3115
6 Functional description
Functional description
6.1
6.1.1
6.1.2
Battery monitoring functions
Operating modes
The monitoring functions include the measurement of battery voltage, current, and
temperature. A Coulomb counter is available to track the SOC when the battery is charging
or discharging at a high rate. A sigma-delta A/D converter is used to measure the voltage,
current, and temperature.
The STC3115 can operate in two different modes with different power consumption (see
Table 8. Mode selection is made by the VMODE bit in register 0 (refer to Table 13 for
register 0 definition).
Table 8. STC3115 operating modes
VMODE
Description
0 Mixed mode, Coulomb counter is active, voltage gas gauge runs in parallel
1
Voltage gas gauge with power saving
Coulomb counter is not used. No current sensing.
In mixed mode, current is measured continuously (except for a conversion cycle every 4 s
and every 16 s seconds for measuring voltage and temperature respectively). This provides
the highest accuracy from the gas gauge.
In voltage mode with no current sensing, a voltage conversion is made every 4 s and a
temperature conversion every 16 s. This mode provides the lowest power consumption.
It is possible to switch between the two operating modes to get the best accuracy during
active periods, and to save power during standby periods while still keeping track of the
SOC information.
Battery voltage monitoring
Battery voltage is measured by using one conversion cycle of the A/D converter every 4 s.
The conversion cycle takes 213 = 8192 clock cycles. Using the 32768 Hz internal clock, the
conversion cycle time is 250 ms.
The voltage range is 0 to 4.5 V and resolution is 2.20 mV. Accuracy of the voltage
measurement is ±0.5% over the temperature range. This allows accurate SOC information
from the battery open-circuit voltage.
The result is stored in the REG_VOLTAGE register (see Table 12).
DocID023755 Rev 4
11/31
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11 Page | ||
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