M52957AFP

Rev.1.0, Sep.19.2003, page 12 of 13

Mask Option

(1) The second integration current value can be doubled.( 2.5µ

5.0µA)

(2) Control terminal variation

1

Full spec (typical)

S

O

U

T

C

L

A

L

V

H

O

L

D

I

N

T

9

10

MICROCOMPUTER

11

8

S

T

B

5

R

E

S

E

T

7

Most simplified type

S

O

U

T

H

O

L

D

I

N

T

9

10

8

2

This type uses

CLALV,STB,RESET,INT,HOLD,SOUT terminal as

I/F terminal to the microcomputer.

This is the typical type at M52957AFP.

This type does not connect CLALV,STB,RESET terminals

to the microcomputer.

When above mentioned terminals are not connected to the

microcomputer without changing mask,connect each

terminal to the ground. In this case,clamp level becomes 0

and standby function is lost. Power on reset in IC is used as

reset.

Explanation of the terminal that can be simplified.

3

(a)CLALV

In the typical type,16way clamp levels can be set by the external control,but also the

terminal can be simplified by mask option as follows.

(I) Clamp level fixation

Selects 1 point from 16 steps of clamp level and fixes it.

(II) Clamp level 2 step changeover

Selects 2 points from clamp level and switches it by

changing CLALV terminal HIGH/LOW. However,as

selecting 2 points,there is a following constraint.

Fixes 3 parts of 4 switches correspond to each bit in figure to

ON or OFF,controls another part by CLALV terminal .

0.125nA

0.25nA

0.5nA

1.0nA

MICROCOMPUTER

(b)STB

When no standby function required such as VCC is suitched ON/OFF,

STB terminal can be eliminated.

(c)RESET

Since IC include power on reset circuit, RESET terminal can be

eliminated, As merit of controlling RESET terminal from outside,

distance detection time can be shortened because there is no need

to switch VCC to STB terminal ON/OFF at consecutive distance detection.