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2

Device Pinout

Pin No

Pin Name

Input /

Output/

Power

Description

1 – 3

NC

-

4

PWR_OPT2

IN

Refer Table 1

5

PWR_OPT1

IN

Refer Table 1

6

XYLED

IN

LED Illumination Control

Input

7

VDDIO

PWR

IO Voltage

8

MOTION

OUT

Motion Detect (Active Low

Output)

9

MOSI

IN

Serial Data Input (Master

Out/Slave In)

10

SCLK

IN

Serial Clock Input

11

MISO

OUT

Serial Data Output

(Master In/Slave Out)

12

GND

PWR

Ground

13

NCS

IN

Chip Select (Active Low

Input)

14 – 33

NC

-

-

34, 45

VDD3/REFB

PWR

Refer Table 1

35 – 38

NC

-

-

39

GND

PWR

Ground

40

DGND

PWR

Ground (digital)

41 – 42

REFA/VDD1_8

PWR

Refer Table 1

43 – 44

NC

-

-

46

VDD5/VDD3

PWR

Refer Table 1

47 – 52

NC

-

-

53

GND

PWR

Ground

54 – 58

NC

-

-

Figure 1. Device Pinout of SDNS-3988

Table 1: Power Option Selections

Low (connect with GND, 0V)

High (connect with VDD supply, 3V)

PWR_OPT1

Enable internal 5V-to-3V regulator

(VDD5 input pin 46 need to be connected to 5V with

REFB pin 34 and 45 connected to *bypass

capacitors)

Disable internal 5V-to-3V regulator

(VDD3 input pin 34, 45 and 46 need to be connected to

3V supply)

PWR_OPT2

Enable internal 3V-to-1.8V regulator

(REFA pin 41 and 42 need to be connected to

*bypass capacitors)

Disable internal 3V-to-1.8V regulator

(VDD1_8 input pin 41 and 42 need to be connected to

1.8V supply)

* Refer to schematic for bypass capacitors value.