ADP5585ACBZ-04-R7 datasheet(8/40 Pages) AD

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ADP5585

Data Sheet

Rev. C | Page 8 of 40

DEVICE ENABLE

When sufficient voltage is applied to VDD and the RST pin is

driven with a logic high level, the ADP5585 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

ADP5585 enters a reset state and all settings return to default.

The RST pin features a debounce filter.

If using the ADP5585ACBZ-01-R7 or ADP5585ACPZ-01-R7

device model, the RST pin acts as an extra row pin. Without a

reset pin, the only method to reset the device is by bringing

VDD below the UVLO threshold.

DEVICE OVERVIEW

The ADP5585 contains 10 multiconfigurable input/output pins.

Each pin can be programmed to enable the device to carry out

its various functions, as follows:

•

Keypad matrix decoding (five-column by five-row matrix

maximum).

•

General-purpose I/O expansion (up to 10 inputs/outputs).

•

PWM generation.

•

Logic function building blocks (up to three inputs and one

output).

•

Two reset generators.

All 10 input/output pins have an I/O structure as shown in

Figure 6.

I/O

VDD

100kΩ

DEBOUNCE

300kΩ

I/O

DRIVE

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 a 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 by using the INT pin.

The ADP5585 is offered with three feature sets. Table 5 lists the

options that are available for each model of the ADP5585.

Table 5. Matrix Options by Device Model

Model

Description

ADP5585ACBZ-00-R7

GPIO pull up (default option)

5-row × 5-column matrix

ADP5585ACBZ-01-R7

Row 5 added to GPIOs

6-row × 5-column matrix

ADP5585ACBZ-02-R7

No pull-up resistors to special function

pins1

5-row × 5-column matrix

ADP5585ACBZ-04-R7

Pull-down resistors to all GPIO pins on

start-up

5-row × 5-column matrix

ADP5585ACPZ-00-R7

GPIO pull up (default option)

5-row × 5-column matrix

ADP5585ACPZ-01-R7

Row 5 added to GPIOs

6-row × 5-column matrix

ADP5585ACPZ-03-R7

Alternate I2C address (0x30)

5-row × 5-column matrix

Special function pins are defined as R0, R3, R4, and C4. See Table 4 for

details.

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