The ADP5587ACBZ-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 2 mm × 2 mm package, the ADP5587ACBZ-R7 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 ADP5587ACBZ-R7 frees the main microprocessor from the need to monitor the keypad, thereby minimizing current drain and increasing processor bandwidth. The ADP5587ACBZ-R7 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 ADP5587ACBZ-R7 has keypad lock 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 ADP5587ACBZ-R7 can be configured as a keypad matrix of up to 8 rows × 10 columns (a maximum of 80 keys).
When the ADP5587ACBZ-R7 is used for smaller keypad matrices, unused row and column pins can be reconfigured to act as general-purpose inputs or outputs. R0 to R7 denote the row pins of the matrix, whereas C0 to C9 denote the column pins. At power-up, all rows and columns default to GPIs and must be programmed to function as part of the keypad matrix or as GPOs.
Two options for I2C addresses exist for the LFCSP package to reduce the chance of port contention and allow up to two ADP5587ACBZ-R7 ICs to operate on the same I2C bus (see the Ordering Guide).
ApplicationsTYPE | DESCRIPTION | Select all |
---|---|---|
Package | Tape & Reel (TR) | |
Operating Temperature | -40°C ~ 85°C | |
Output Type | Open Drain | |
Features | Keypad Controller, POR | |
Interrupt Output | Yes | |
Interface | I²C | |
Number of I/O | 18 | |
Supplier Device Package | 25-WLCSP (1.97x1.97) | |
Programmable | Not Verified | |
Package / Case | 25-UFBGA, WLCSP | |
Product Status | Active | |
Mounting Type | Surface Mount | |
Voltage - Supply | 1.65V ~ 3.6V | |
Clock Frequency | 400 kHz |
Analog Devices Inc.
Analog Devices (NASDAQ: ADI) leads in crafting high-performance analog, mixed-signal, and digital signal processing integrated circuits. For decades, they've tackled signal processing challenges across global electronics. With over 100,000 clients, their products convert real-world phenomena into electrical signals. Merged with Maxim Integrated, they offer top-tier mixed-signal and power management technologies, solving complex problems from DC to 100 GHz and sensor to cloud.
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