Pin Assignment

Pin Description

Pin Name

I/O

Description

SDI

I

Serial I/O data input

SDI is high impedance when SCS = HIGH

SDO

O

Serial I/O data output.

SDO is high impedance when SCS = HIGH

SCK

I

Serial I/O clock input

SCK is high impedance when SCS = HIGH

SCS

I

Serial I/O Chip select input, active low

SCS has an internal pull-high resistor.

CLKI

I

External clock input

INT

O

Interrupt output (CMOS output structure).

Connected to the MCU

¢s external interrupt input

RX

I

UART RX Pin

If UARTEN = 1 and RXEN = 1, then RX is the UART serial data input

If UARTEN=0or RXEN = 0, then RX is high impedance

TX

O

UART TX Pin

If UARTEN = 1 and TXEN = 1, then TX is the UART serial data output

If UARTEN=0or TXEN = 0, then TX is high impedance

VDD

¾ Positive power supply

VSS

¾ Negative power supply, ground

NC

¾ No connection

Absolute Maximum Ratings

Storage Temperature ..........................

-50°C to +150°C

Operating Temperature.........................

-40°Cto+85°C

-35mA

Total Power Dissipation .....................................135mW

Note: These are stress ratings only. Stresses exceeding the range specified under

²Absolute Maximum Ratings² may

cause substantial damage to the device. Functional operation of this device at other conditions beyond those listed

in the specification is not implied and prolonged exposure to extreme conditions may affect device reliability.

HT45B0F

Rev. 1.00

2

June 7, 2011

S D I

S D O

S C K

S C S

C L K I

I N T

N C

N C

H T 4 5 B 0 F

1 6 N S O P - A

N C

N C

N C

N C

T X

R X

V D D

V S S

1 6

1 5

1 4

1 3

1 2

1 1

1 0

9

1

2

3

4

5

6

7

8