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ADP5589CP-EVALZ Datasheet(PDF) 8 Page - Analog Devices

Part No. ADP5589CP-EVALZ
Description  Keypad Decoder and I/O Expansion
Download  52 Pages
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

ADP5589CP-EVALZ Datasheet(HTML) 8 Page - Analog Devices

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Data Sheet
Rev. B | Page 8 of 52
When sufficient voltage is applied to VDD and the RST pin is
driven with a logic high level, the ADP5589 starts up in standby
mode with all settings at default. The user can configure the
device via the I2C interface. When the RST pin is low, the
ADP5589 enters a reset state and all settings return to default.
The RST pin features a debounce filter.
The ADP5589 contains 19 multiconfigurable input/output pins.
Each pin can be programmed to enable the device to carry out
its various functions, as follows:
Keypad matrix decoding (11-column by 8-row matrix
General-purpose I/O expansion (up to 19 inputs/outputs).
PWM generation.
Clock division of externally supplied source.
Dual logic function building blocks (up to three inputs,
one output).
Two reset generators.
All 19 input/output pins have an I/O structure, as shown in
Figure 6.
Figure 6. I/O Structure
Each I/O can be pulled up with a 100 kΩ or 300 kΩ resistor or
pulled down with a 300 kΩ resistor. For logic output drive, each
I/O has a 5 mA PMOS source and a 10 mA NMOS sink for
push-pull type output. For open-drain output situations, the
5 mA PMOS source is not enabled. For logic input applications,
each I/O can be sampled directly or, alternatively, sampled
through a debounce filter.
The I/O structure shown in Figure 6 allows for all GPI and GPO
functions, as well as PWM and clock divide functions. For key
matrix scan and decode, the scanning circuit uses the 100 kΩ or
300 kΩ resistor for pulling up keypad row pins and the 10 mA
NMOS sinks for grounding keypad column pins (see the Key
Scan Control section for details about key decoding).
Configuration of the device is carried out by programming an
array of internal registers via the I2C interface. Feedback of
device status and pending interrupts can be flagged to an
external processor via the INT pin.
The ADP5589 is offered with three feature sets. Table 5 lists the
options that are available for each model of the ADP5589.
Table 5. Available Options
All GPIOs pulled up (default option)
Reset pass-through1
Pull-down on special function pins2
Reset pass-through implies that the RESET1 output (R4) follows the logic
level of the reset input pin, RST, after the oscillator has been enabled.
Special function pins are defined as R0 (Row 0), R3 (Row 3), R4 (Row 4), C4
(Column 4), C6 (Column 6), and C9 (Column 9).

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