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ADP5587

Analog Devices
Part Number ADP5587
Manufacturer Analog Devices
Description Mobile I/O Expander And QWERTY Keypad Controller
Published Feb 7, 2010
Detailed Description Data Sheet FEATURES 18-GPIO port expander or 10 × 8 keypad matrix GPIOs configurable as GPIs, GPOs, and keypad rows or c...
Datasheet PDF File ADP5587 PDF File

ADP5587
ADP5587

Overview
Data Sheet FEATURES 18-GPIO port expander or 10 × 8 keypad matrix GPIOs configurable as GPIs, GPOs, and keypad rows or columns I2C interface with auto-increment 1.
65 V to 3.
6 V operation Keypad lock capability Open-drain interrupt output Key press and key release interrupts GPI interrupt with level programmability Programmable pull-ups Key event counter with overflow interrupt 275 μs debounce on the reset line and GPIs 1 μA typical idle current 55 μA typical polling current 4 mm × 4 mm LFCSP package Small 2 mm x 2 mm WLCSP package, 0.
4 mm pitch Multiple I2C addresses available for the LFCSP package to allow multiple port expanders on the same bus APPLICATIONS Keypad and I/O expander designed for QWERTY type phones that require a large keypad matrix GENERAL DESCRIPTION The ADP5587 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 2 mm × 2 mm package, the ADP5587 contains enough power to handle all key scanning and decoding and to flag the processor of key presses and releases via the I2C interface and interrupt.
The ADP5587 frees the main microprocessor from the need to monitor the keypad, thereby minimizing current drain and increasing processor bandwidth.
The ADP5587 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 ADP5587 has keypad lock capability with an option to trigger or not trigger an interrupt at key presses and releases.
Mobile I/O Expander and QWERTY Keypad Controller ADP5587 FUNCTIONAL BLOCK DIAGRAM ADP5587 GND 19 VCC 21 SCL 23 SDA 22 RST 20 INT 24 CONTROL REGISTERS CONTROL INTERFACE C9 18 C8 17 R7 R6 R5 R4 R3 R2 R1 R0 C0 C1 C2 C3 C4 C5 C6 C7 08612-001 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Figure 1.
All c...


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