Date: 09/09/2011
30ľA active current drain GPIO controllers packs programmable logic/PWM
Analog Devices, Inc. has introduced the ADP5585 and ADP5589 GPIO (general-purpose input/output) port expander and keypad matrix controllers for devices that require expanded I/O lines or mechanical keypads up to QWERTY size without increasing the pin count. According Analog Devices, the new GPIO/keypad controllers feature the industry's lowest active current drain and integrated programmable logic/PWM (pulse-width modulator) in the smallest available package, saves battery life in portable devices by consuming less than 30 ľA (typical) when keys are pressed and less than 1 uA (typical) when the keys are idle.
Analog Devices explains that the ADP5585 and ADP5589 simplify interface connectors by saving up to 10 I/O lines (ADP5585) and 19 I/O lines (ADP5589) to the main processor, and both keypad controllers support multiple, simultaneous key press detection and communicate presses and releases in a chronological order via a 16-byte FIFO. In addition to the built-in programmable logic devices, two programmable reset generators allow designers to program keys, GPIOs, and/or logic changes to generate a reset signal to restart a locked up processor. Both devices are available in small LFCSP (ADP5585: 3.0 mm × 3.0 mm; ADP5589: 3.5 mm × 3.5 mm) and WLCSP packages (ADP5585: 1.59 mm × 1.59 mm; ADP5589: 1.99 mm × 1.99 mm).
The ADP5585 and ADP5589 devices free up the main processor from having to monitor the keypad, thereby reducing power consumption and increasing processor bandwidth for other functions and the new controllers handle all key scanning and decoding functions and use an interrupt line to flag the main processor when new key events have occurred, explains Analog Devices.
Availability and PricingProduct Sample Availability Full Production Price Each Per 1,000 Packaging
ADP5585 Now Now $0.75 16-lead LFCSP
16-bump WLCSP
ADP5589 Now Now $1.20 24-lead LFCSP
25-bump WLCSP
ADP5585CP-EVALZ Now Now $160 Evaluation Board
ADP5589CP-EVALZ Now Now $160 Evaluation Board