 2010 Microchip Technology Inc.

Preliminary

DS70632A-page 9

MRF24WB0MA/MRF24WB0MB

TABLE 1-1:

Pin Description

Pin

Symbol

Type

Description

1

GND

P

Ground

2

NC

NC

Do not connect

3

O

JTAG test data output

4

JTAG clock input

5

I

JTAG mode input

6

I

JTAG test data input

7

RESET

Module Reset input

8

NC

NC

Do not connect

9

I

JTAG Reset input (optional; see Section 2.0)

10

GND

P

Ground

11

NC

NC

Do not connect

12

NC

NC

Do not connect

13

NC

NC

Do not connect

14

NC

NC

Do not connect

15

NC

NC

Do not connect

16

I

Write protect (this pin is used to enable FLASH update)

17

VDD

P

Power

18

GND

P

Ground

19

GND

P

Ground

20

HIBERNATE

I

Hibernate mode enable (high input will disable the module)

21

I

JTAG test enable

22

NC

NC

Do not connect

23

CS

I

SPI Chip Select input

24

NC

NC

Do not connect

25

GND

P

Ground

26

I

Serial debug port input (see Section 2.0)

27

O

Serial debug port output (see Section 2.0)

28

GND

P

Ground

29

VDD

P

Power

30

GND

P

Ground

31

NC

NC

Do not connect

32

SDO

O

SPI data out

33

INT

O

Interrupt output (open drain – requires a pull-up)

34

SCK

I

SPI clock input

35

SDI

I

SPI data in

36

GND

P

Ground

Legend: Pin type abbreviation: P = Power input, I = Input, O = Output, NC = Do Not Connect

Note 1:

Signals of Type “I: Constant” must either be constantly driven by the host or have a pull-up or pull-down (in

case the host is likely to tri-state the signal during power down modes). The constant drive is used to

ensure defined operation of the part and to minimize leakage current during low power modes.

2:

WP is used as write-protect for the internal module SPI Flash. For production use, this pin should be

pulled low. For end application, this pin can be controlled by the host microcontroller to enable in field

Flash updates.