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PDF STC3117 Data sheet ( Hoja de datos )
| Número de pieza | STC3117 | |
| Descripción | Gas gauge IC | |
| Fabricantes | STMicroelectronics | |
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STC3117
Gas gauge IC with battery charger control for handheld applications
CSP (1.49 x 1.594 mm)
Datasheet - production data
Description
The STC3117 includes the STMicroelectronics
OptimGauge™ algorithm. It provides accurate
battery state-of-charge (SOC) monitoring, tracks
battery parameter changes with operation
conditions, temperature, and aging, and allows
the application to get a battery state-of-health
(SOH) indication.
An alarm output signals low SOC or low voltage
conditions and also indicates fault conditions like
a missing or swapped battery.
Features
• Patented OptimGauge™ algorithm for accurate
battery capacity calculation
• Robust initial open-circuit-voltage (OCV)
measurement at power up
• Programmable low battery alarm
• Missing/swapped battery detection
• Average current internal calculation
• End-of-charge detection
• Internal temperature sensor
• Battery swap detection with protection against
false battery insertion
• Low power: 40 µA in voltage-only mode, 2 µA
max in standby mode
• 1.49 x 1.594 mm 9-bump CSP package
Applications
• Mobile phones, multimedia players, digital
cameras
• Portable medical equipment
January 2015
This is information on a product in full production.
DocID025792 Rev 2
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www.st.com
1 page  
STC3117
2 Pin assignment
Pin assignment
Table 1. STC3117 pin description
CSP bump
pin no.
Pin name
Type(1)
Function
C3
ALM
O/OD
Alarm signal output, open drain,
external pull-up with resistor
A2
SDA
I/OD
I2C serial data
B2 SCL I_D I2C serial clock
A3
GND
Ground Analog and digital ground
B3 CS I_A Current sensing input
B1
BATD
I/OA
Battery detection input
A1 CD O/OD Battery charge inhibit (active high output)
C2
VCC
Supply Power supply
C1 VIN I_A Battery voltage sensing input
1. I = input, 0 = output, OD = open drain, A = analog, D = digital, NC = not connected
Figure 2. STC3117 pin connections (top view)
CD SDA GND
BATD SCL
CS
VIN VCC ALM
CSP (1.49 x 1.594 mm)
Top view (balls are underneath)
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STC3117
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 STC3117 can operate in two different modes with different power consumption (see
Table 7. Mode selection is made by the VMODE bit in register 0 (refer to Table 12 for
register 0 definition).
Table 7. STC3117 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 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 11).
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| PDF Descargar | [ Datasheet STC3117.PDF ] | |
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