ADP5588ACPZ-R7

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1. DESCRIPTION

The ADP5588ACPZ-R7 is an I/O port expander and keypad matrix designed for QWERTY type phones that require a large keypad matrix and expanded I/O lines. I/O expander ICs are used in mobile platforms as a solution to the limited number of GPIOs available in the main processor. In its small 4 mm × 4 mm package, the ADP5588ACPZ-R7 contains enough power to handle all key scanning and decoding and flag the processor of key presses and releases via the I2C® interface and interrupt. It frees the main microprocessor from having to monitor the keypad, thereby minimizing current drain and increasing processor bandwidth. It is also equipped with a buffer/FIFO and key event counter to handle and keep track of up to 10 unprocessed key or GPI events with overflow wrap and interrupt capability. The ADP5588ACPZ-R7 has a keylock capability with an option to trigger or not trigger an interrupt at key presses and releases. All communication to the main processor is done using one interrupt line and two I2C-compatible interface lines. The ADP5588ACPZ-R7 can be configured to have a keypad matrix of up to 8 rows × 10 columns (a maximum of 80 keys).  When used for smaller keypad matrices, unused row and column pins can be reconfigured to act as general-purpose inputs, outputs, or light sensor inputs. At power-up, all rows and columns default as GPIs and must be programmed to function as part of the keypad matrix, GPOs, or light sensor inputs. In addition to keypad and GPIO functionalities, C8 and C9 can also be configured as light sensor inputs. When configured as keypad lines, the function of the C8 and C9 lines is straightforward: the control interface disconnects these lines from the comparator inputs, disables the light sensor comparator, and connects them to the keypad columns of the keypad matrix. When used as light sensor comparator inputs, the control interface disconnects these pins from the keypad, enables the comparators, and connects these lines to the comparator inputs. Two external capacitors (0.1 μF) are required when these pins are configured as light sensor inputs. When used as GPIOs, these pins are removed from the keypad and the light sensor interface, and the light sensor comparators are disabled, along with the logic for the sensors. 

2. FEATURES

    1. 18-GPIO port expander or 10 × 8 keypad matrix

    2. GPIOs configurable to GPIs, GPOs, and keypad rows or columns

    3. Dual light sensor inputs (C8 and C9)

    4. I2C interface

    5. I2C register read autoincrement

    6. 1.8 V to 3.0 V operation

    7. Keypad lock capability

    8. Open-drain interrupt output

    9. Key press and key release interrupts

  10. GPI interrupt with level programmability

  11. Programmable pull-ups

  12. Key event counter with overflow interrupt

  13. 50 μs debounce on the reset line and GPIs

  14. 1 μA typical idle current, 55 μA typical polling current drain for one key press

  15. Small 4 mm × 4 mm LFCSP package

3. APPLICATIONS

    1. Keypad and I/O expander designed for QWERTY type phones that require a large keypad matrix