The BQ26500 is the first advanced gas measurement device in the bqJUNIOR family for handheld applications. It is a high-precision stand-alone single-cell lithium-ion and lithium-POL battery capacity monitoring and reporting device for portable applications with limited space.
Pin definition
The device monitors the voltage drop through a small current-induced resistor in series with the battery to determine the battery's charge-discharge activity. Compensation for battery temperature, self-discharge, and discharge rate is applied to charge counters to provide available capacity under a wide range of operating conditions. The capacity of the battery is automatically recalibrated or learned during the discharge cycle from full to empty. Internal registers include available capacity, battery temperature and voltage, charging status, and status and control registers.
The BQ26500 can directly use single-cell lithium-ion and lithium-POL batteries and communicate with the system through a simple single-wire bi-directional serial interface. The 5kbits /s HDQ bus interface reduces the communication overhead of the external microcontroller
BQ26500 Typical Application Circuit
BQ26500 Functional Block Diagram
Power mode
The BQ26500 has four power modes: active mode, sleep mode, boot mode, and sleep mode. Figure 5 shows the flow of moving devices between active, sleep, and send modes. Hibernate is a special pattern that is not included in the flow. A detailed description of each pattern is shown below.
