P9235A-R Datasheet

© 2016 Integrated Device Technology, Inc

7

May 17, 2016

Pin Description

Table 6. Pin Descriptions

Pin(s) Name

Type

Description

1

EN

¯¯

I

Active low enable pin. When connected to logic high, the device shuts down and

consumes less than 25 µA of current. When connected to logic low, the device is in

normal operation.

2

GND_S

-

Ground connection.

3

VO_5

O

Regulated output voltage used for the internal device biasing. Connect a 1 µF capacitor

from this pin to ground. This pin should not be externally loaded.

4

VIN

I

Input power supply. Connect a 10 µF capacitor from this pin to ground.

5

SW_B

O

Step-down regulator switch node. Connect one of the terminals of a 4.7 µH inductor to this

pin.

6

GND_B

-

Ground connection.

7

VO_33

O

Regulated 3.3 V output voltage used for internal device biasing. Connect a 1 µF capacitor

from this pin to ground. This pin should not be externally loaded.

8

VIN_LDO

I

Low Dropout input power supply. Connect this pin to a 5 V source, either to the output of

the 5 V output step-down regulator or to the input power supply pin, VIN.

9

VO_18

O

Regulated 1.8 V output voltage used for internal device biasing. Connect a 1 µF capacitor

from this pin to ground. This pin should not be externally loaded.

10

RSVD1

I

This pin is reserved for internal use only. Pull down to ground with an external 47 kΩ

resistor.

11

RSVD2

I

This pin is reserved for internal use only. Pull down to ground with an external 47 kΩ

resistor.

12

VDDIO

I

Input power supply for all GPIOs. Can be connected to a power supply ranging from 1.8 –

5.0 V.

13

SCL

I

14

SDA

I/O

15

ILIM

I

Programmable over-current limit pin. Connect a resistor from this pin to GND to set the

current-limit threshold. To disable the current-limit, connect the pin directly to GND. For

more information, see current limit application section.

16

LED_PAT

I

Programmable LED pattern selection. Connect the center tap of the resistor divider to this

pin. For more information on various LED blinking pattern, see LED pattern application

section.

17

GPIO_A4

I/O

General purpose input/output. The GPIO’s power is supplied from the VDDIO pin. This pin

is configured as an output. If it is not used then it may be left floating.

18

TS

I

Remote temperature sensing. Connect a 10 k NTC via a voltage divider to this pin.

19

BUZ

O

Buzzer pin output.