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BQ4285E Datasheet(PDF) 6 Page - Texas Instruments |
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BQ4285E Datasheet(HTML) 6 Page - Texas Instruments |
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6 / 32 page  Interrupts The bq4285E/L allows three individually selected inter- rupt events to generate an interrupt request. These three interrupt events are: n The periodic interrupt, programmable to occur once every 122 µs to 500 ms. n The alarm interrupt, programmable to occur once per second to once per day, is active in battery-backup mode, providing a “wake-up” feature. n The update-ended interrupt, which occurs at the end of each update cycle. Each of the three interrupt events is enabled by an indi- vidual interrupt-enable bit in register B. When an event occurs, its event flag bit in register C is set. If the corre- sponding event enable bit is also set, then an interrupt request is generated. The interrupt request flag bit (INTF) of register C is set with every interrupt request. Reading register C clears all flag bits, including INTF, and makes INT high-impedance. Two methods can be used to process bq4285E/L inter- rupt events: n Enable interrupt events and use the interrupt request output to invoke an interrupt service routine. n Do not enable the interrupts and use a polling routine to periodically check the status of the flag bits. The individual interrupt sources are described in detail in the following sections. Periodic Interrupt The mux output used to drive the SQW output also drives the interrupt-generation circuitry. If the periodic interrupt event is enabled by writinga1tothe periodic interrupt enable bit (PIE) in register C, an interrupt re- quest is generated once every 122 µs to 500ms. The pe- riod between interrupts is selected by the same bits in register A that select the square wave frequency (see Ta- ble 3). Setting OSC2–OSC0 in register A to 011 does not affect the periodic interrupt timing. 6 Register A Bits Square Wave Periodic Interrupt OSC2 OSC1 OSC0 RS3 RS2 RS1 RS0 Frequency Units Period Units 0100000 None None 0100001 256 Hz 3.90625 ms 0100010 128 Hz 7.8125 ms 0100011 8.192 kHz 122.070 µs 0100100 4.096 kHz 244.141 µs 0100101 2.048 kHz 488.281 µs 0100110 1.024 kHz 976.5625 µs 0100111 512 Hz 1.95315 ms 0101000 256 Hz 3.90625 ms 0101001 128 Hz 7.8125 ms 0101010 64 Hz 15.625 ms 0101011 32 Hz 31.25 ms 0101100 16 Hz 62.5 ms 0101101 8 Hz 125 ms 0101110 4 Hz 250 ms 0101111 2 Hz 500 ms 0 1 1 XXXX 32.768 kHz same as above defined by RS3–RS0 Table 3. Square-Wave Frequency/Periodic Interrupt Rate bq4285E/L |
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