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ADP5587 数据表(PDF) 10 Page - Analog Devices |
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ADP5587 数据表(HTML) 10 Page - Analog Devices |
10 / 24 page ADP5587 Rev. B | Page 10 of 24 Auto-Increment The ADP5587 features automatic increment during I2C read access, which allows the user to increment the address pointer without the need to send a read command for subsequent addresses. This minimizes processor intervention and, therefore, saves processor bandwidth and current drain. Bit 7 of Register 0x01 must be set to initiate auto-increment (see Figure 17 for the full write and read sequence). Key Event Interrupt On a key event (KE) interrupt, the processor reads the interrupt status register to determine the cause of the interrupt. If the KE_INT bit in Register 0x02 is set, the processor reads the key event count from the KEC [3:0] field in Register 0x03 to determine the number of events. After reading all the events from the FIFO, it then reads the KEC field again (in Register 0x03) to make sure that no new events have come in. After all the events are read, the KEC field is decremented to zero (KEC = 0), and the KE_INT bit can be cleared by writing a 1 to it. Both key presses and key releases are capable of generating key event interrupts. The KE_INT bit cannot be cleared, and the INT pin cannot be deasserted, until the FIFO is cleared of all events. KEYPAD MODE KEC REG. 0x1D THROUGH REG. 0x1F REG. 0x03 READ KE(s) TO CLEAR INT DRIVE KE_INT REG. 0x02 WRITE 1 TO CLEAR KE_IEN REG. 0x01 AND Figure 11. Key Event Interrupt Generation START MASK TIMER = 0 KEY PRESS DETECTED NO NO YES NO NO NO YES YES YES NO YES YES YES NO YES YES NO NO YES YES NO GENERATE KE INTERRUPT START MASK TIMER MASK TIMER EXPIRES MASK TIMER EXPIRES GENERATE KEYLOCK INTERRUPT FIRST UNLOCK KEY DETECTED SECOND UNLOCK KEY DETECTED START UNLOCK1 TO UNLOCK2 UNLOCK1 TO UNLOCK2 TIMER EXPIRES KEY PRESS DETECTED START UNLOCK1 TO UNLOCK2 FIRST UNLOCK KEY DETECTED GENERATE KEYLOCK INTERRUPT SECOND UNLOCK KEY DETECTED UNLOCK1 TO UNLOCK2 TIMER EXPIRES NO Figure 12. Keypad Lock Interrupt Mask Timer Flowchart |
类似零件编号 - ADP5587_1 |
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类似说明 - ADP5587_1 |
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