Absolute Maximum Ratings

Supply Voltage.................................-0.3V to 5V

Storage Temperature.................-50°Cto125°C

Operating Temperature ..................0°Cto70°C

Note: These are stress ratings only. Stresses exceeding the range specified under ²Absolute Maxi-

mum Ratings² may cause substantial damage to the device. Functional operation of this de-

vice at other conditions beyond those listed in the specification is not implied and prolonged

exposure to extreme conditions may affect device reliability.

Electrical Characteristics

Ta=25°C

Symbol

Parameter

Test Conditions

Min.

Typ.

Max.

Unit

Conditions

Operating Voltage

¾¾

1.3

1.5

1.7

V

Operating Current

1.5V No load,

¾

1.5

3

mA

Standby Current

1.5V

¾¾

0.5

1

mA

Input Low Voltage

1.5V

¾¾

¾

V

Input High Voltage

1.5V

¾

¾¾

V

System Frequency

1.5V

¾¾

32

¾

kHz

HT1350

4

June 28, 1999

Functional Description

The HT1350 is a step counter IC. It is used to au-

tomatically count the step number taken by a

runner and to display the whole course (kilome-

ter/mile) combined with the calories consumed

on the LCD.

The IC is turned on and off with respect to the

on/off status of a short of spring switch which

corresponds to the up/down motion of the steps.

The output of step number can be changed to

kilometers/miles or calories by counting the to-

tal number of times the step switch is closed.

The IC can automatically distinguish between

walking and jogging and make the according

calculations. The output of the LCD is busy

when the RESET key is pressed. Once the LCD

is in the busy state, the step counter will start

counting at 0 after 0.5 seconds till the runner

stops running and stands still. After the step

counter stops counting, pressing the MODE

key will display the step number®mile®kilo-

meter®calorie in sequence.