BQ24133RGYR Detailed explanation of pin function specifications and circuit principle instructions

The "BQ24133RGYR" is a product from Texas Instruments (TI). It is a Battery Management IC typically used for charging, managing, and protecting lithium-ion or lithium-polymer batteries. This particular model is part of their BQ24133 series and is designed for high-efficiency battery charging with integrated Power management.

Package and Pinout Description:

The "BQ24133RGYR" comes in a QFN-32 (Quad Flat No-lead) package, which is a 32-pin surface-mount device with the following pin configuration:

Pin Number Pin Name Pin Function Description 1 GND Ground pin. Connect to the ground of the system. 2 PGND Power ground. Separate from GND to minimize noise. 3 TS Thermistor input for temperature sensing. Used for battery temperature monitoring. 4 ISET1 Current sense input for charging current setting (via an external resistor). 5 ISET2 Another input for charging current setting (via an external resistor). 6 EN Enable input. When low, disables the charging function. 7 CHRG Charge status output. Indicates whether the charging process is in progress. 8 STAT1 Charge status indicator 1. Provides the state of charge status. 9 STAT2 Charge status indicator 2. Provides the state of charge status. 10 FAULT Fault output. Indicates if the device is in a fault state, such as over-temperature or over-voltage. 11 VSTOR Voltage storage pin. Connects to the battery to provide the voltage. 12 VBAT Battery voltage input. 13 VCC Power supply input. 14 PSEL Power selection pin. Used to select between the battery and external power source for powering the device. 15 SYS System output. Provides regulated system voltage to power the load. 16 CHGEN Charge enable input. When low, disables charging, and when high, enables charging. 17 OVP Over-voltage protection pin. Used for detecting over-voltage conditions in the system. 18 FST Fast charge status output. 19 CE Chip enable pin. Controls the operational state of the chip. 20 RESET Reset input. When pulled low, it resets the IC. 21 SMPS1 SMPS input 1, for the switching regulator control. 22 SMPS2 SMPS input 2, for the switching regulator control. 23 I2C SDA I2C serial data line. Used for communication with a host controller. 24 I2C SCL I2C serial clock line. Used for clock synchronization with I2C. 25 PGOOD Power good output. Signals if the system has a valid power source. 26 CHG Charge current output pin. Controls the battery charge current. 27 PBIAS Bias power for internal logic. 28 BATTERY Battery connection terminal. 29 FET1 Output FET control for charging. Controls charging through the MOSFET. 30 FET2 Output FET control for charging. Controls charging through the MOSFET. 31 FET3 Output FET control for charging. Controls charging through the MOSFET. 32 TS2 Second thermistor input for temperature sensing.

Pin Function FAQs:

1. What is the purpose of the EN pin?

The EN pin controls the enabling of the charging function. When low, it disables charging, and when high, it enables charging.

2. How does the STAT1 pin work?

The STAT1 pin is used to indicate the charging status. It can signal different charging states like "Charging," "Done," or "Fault."

3. What is the role of the TS pin?

The TS pin is for connecting a thermistor. It is used to monitor the battery's temperature to prevent charging in unsafe conditions.

4. Why is there an I2C interface in the BQ24133RGYR?

The I2C interface (SDA and SCL) allows the device to communicate with a microcontroller or host to configure charging parameters or read status.

5. Can the BQ24133RGYR be used with any battery?

It is designed for lithium-ion or lithium-polymer batteries, so ensure compatibility before use.

6. What does the CHRG pin indicate?

The CHRG pin indicates whether the battery is being charged, signaling the charge status.

7. What is the function of the FAULT pin?

The FAULT pin reports any errors or fault conditions, such as over-voltage, under-voltage, or over-temperature.

8. What is the purpose of the RESET pin?

The RESET pin is used to reset the IC, pulling it low for a reset operation.

9. How can I adjust the charge current?

The charge current is set by external resistors connected to the ISET1 and ISET2 pins.

10. What does the VCC pin do?

VCC is the power supply input, providing voltage to the device for operation.

11. How can the BQ24133RGYR be enabled for charging?

The CHGEN pin is used to enable or disable charging. When low, charging is disabled, and when high, it is enabled.

12. What should be connected to the BATTERY pin?

The BATTERY pin connects to the battery, allowing the charging and discharging of the cell.

13. Can the BQ24133RGYR handle fast charging?

Yes, the IC supports fast charging, and you can monitor the status using the FST pin.

14. How is over-voltage protection handled?

The OVP pin monitors the voltage. If the voltage exceeds a set threshold, protection is triggered to avoid damage.

15. What happens if the FET1-3 pins are not connected?

These pins control the MOSFETs that regulate the current flow for charging. Not connecting them would disrupt the charging operation.

16. How does the chip handle thermal management?

The TS pin and additional thermistor inputs allow the IC to monitor and manage temperature, preventing charging in unsafe conditions.

17. How do I know if the system is powered properly?

The PGOOD pin indicates whether the system is receiving stable and valid power for proper operation.

18. What does the ISET1 and ISET2 control?

These pins are for setting the charging current through external resistors, providing flexibility for different charging requirements.

19. What is the function of the PSEL pin?

The PSEL pin is used to choose between the external power source and battery for powering the device.

20. Can I use the BQ24133RGYR with multiple batteries?

The BQ24133RGYR is typically designed for single-battery applications, so using it with multiple batteries might require additional circuitry.

The BQ24133RGYR is a versatile IC, and careful attention to each pin’s functionality and proper configuration will ensure safe and efficient operation in battery-powered applications.