Logic Scan Modules

iHall Effect Keyboards S016 Keyswitch Modules

GENERALFOUR-TERMINALSD MODULE ELECTRICAL

INFORMATION

The charts at right contain the general electrical data on MICRO SWITCH SD Hall effect modules.

Logic Scan Modules

Logic scan modules have one isolated input and one isolated output. They are designed to interface readily with logic devices for microcomputer control. The module's output signal is valid when the input interrogation signal (clock pulse) is low and the key is depressed. The input signal (at ground) wilt enable a logic

gate; the output will reflect the normal performance of a level sinking output.

When the input is at a high level, the

output is inhibited by forcing the output transistor into the OFF state.

OPERATING CHARACTERISTICS

The function of a scan module is to

provide an interface between the Hall

chip (transducer) and a microprocessor or scanning encoder. An output signal is valid when the input interrogation

signal (clock pulse) is low and the key is

LOGIC SCAN

Power

Requirements Input ⁱ

output

Rise and Fall Time Propagation Delay*

TEMPERATURE

Storage Operating

4.5 to 5.5 VDC

3.5mA max. standby current (switch unoperated) Input High

Voltage: 2.0VDC min.

Current: .060mA max. at 2.4VDC Input Low

Voltage: O.8VDC max.

Current: 10~A max. at O.4VDC Unoperated and/or input high

1.01JA max. leakage to ground at 10.0VDC Operated (input low)

O.4VDC max. while sinking 4.0mA max.

10 ^~sec max.

1.1 ~sec

RL = 1.6K ohm C_L = 50pf

•

depressed. The input signal (when at ground) will enable a logic gate; the

output will reflect the normal perfor-

mance of a level sinking output. When the input is at a high level, the output is

inhibited by forcing the output trans-istor into the OFF state.

TYPICAL FORCE DISPLACEMENT CURVES SD MODULES

180 170

.'

"\:> ^01,-

-

^{C/) 150} 160 ^....-.. (/)

E co 140 130

Logic Scan Output ~ SO Momentary Module ~

2

,..---,~--o + 5 VOLTS

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: TRANSDUCER ^I _... ... - OUTP

INPUT

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VIN (HIGH)

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--- ---

50% ^....

^- - -- ^{- -}

VIN (LOW) I

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: CIRCUITRY

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PROP. DELAY .. J

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^{I -4-4 -} PROP. DELAY

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^UNO

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Vo (HIGH) ... --....L 1--I

VO(LOW) RISE TIME ^--..4

I 90% l . . , . r - - - - -

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90%

---

50~

10~ 10%

--- ---

^...

t+-FALL TIME RELEASE ^{- - J}

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<D

<.,) ' -0

LL

0>

.-... c

co ' -

<D

0 Cl.

120 110 100

90 80

70

60

50 40 30 20

10

Nominal Force/Displacement ⁽⁹ ~

a

.020 .040.060.080.100.120.140.160 Travel (Inches)

"--'

GENERAL THREE-TERMINAL SO MODULE ELECTRICAL

INFORMATION

THREE-TERMINAL MODULE

MICRO SWITCH three-terminal Hall effect modules can interface directly

with a port expander and microcomputer to operate either in a scanned mode or

in a level sourcing mode as a function switch. The function mode is similar to

any level switching four-terminal SO

module with the normal performance of a level sourcing signal (emitter follower).

Operate point, full overtraveJ and

release point are virtually the same as any four-terminal module.

In the scanned mode, the minus supply connection becomes the scanning input connection. When the input is high, the

module is de-energized and does not consume power. When the scan input

is low, the module will draw current as it normally does when energized. If the

plunger is depressed when the scan

input is low, the output will be high. The output will remain low if the plunger is

not depressed during the scan cycle.

This scanning technique significantly reduces the total power supply require- ments when used in a scan matrix since the module requires power only during the period of time it is being strobed in the scan sequence.

PERFORMANCE SPECIFICATIONS

Temperature Humidity

Vibration (nonoperating)

I

Operating: 0° to 55°C (32° to 131°F) Storage: -40° to BO°C (-40° to 140°F)

Up to 90% RH

10 to 59 Hz at .005 in 10.13mm displacement.

56 to 500 Hz at 5 Gs Mechanical Shock (nonoperating) 15 Gs, 11 mA duration

ELECTRICAL DATA

+5VDC regulated ±5% ^@ 30mA typical

SD Series

Power

Requirements 4.8mA max. power supply current drain with input at O.OVDC Input Current -2.5mA typical, -3.BmA max. input at Logic "0" (O.BVDC max.)

Output Voltage Logic "1" (high) 2.4VDC min; 3.7VDC typical at 5mA current sourcing Leakage Logic "0"; 1.01JA max.

Rise time 0.1 IJsec typical, 1.5 IJsec max.

Fall time 0.4 IJsec typical, 1.5 IJsec max.

Propagation Delay* 0.5 IJsec typical, 2.5 IJsec max.

* Input change to output stable level

.,...OUTPUT

I

I ^{- - t - -} +5VDC

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' - -_ _ --6 ---INPUT

- _-

INPUT

-

HALL

CKT

OYcc

SD SWITCH MODULE OPERATING CHARACTERISTICS

N = Newtons (.278 x oz.)

75°F (±24°C) and with 5VOC ±.5 regulated supply voltage

*For use under multistation key tops

Half Force*

Total Travel

mm

4,1 ±O,51

• .1BO ±.020

In.

Force at .090"/2,3mm N 0,38

Travel (nom.) oz 1.3

Force at Full Travel N 0,42

oz 1.5

Operating Point

mm

1,5 to 3,0

• .06 to .12

In.

Release Point

mm

₁₁₀

(min.) In. ^• .04

Vee

-

-.

OUTP.UT

- _-

Standard

4,1 ±O,51 .1BO ±.020 0,69

2.5 0,83 3.0

1,5 to 3,0 .06 to .12 1,0

.04

S016 Keyswitch Modules

MOUNTING DIMENSIONS

(For reference only)

Four-Terminal SO Module

c-

STEPPED

605 030

445 ±

015 x 025 TERMINALS (4)

STANDARD

/ - - - 3eT/03 BUT rON

. 460 ± 020

FREE POSITION

MOUNTiNG PLATE BURR SIDE

140 (3}...t

• 160 ~ 010

OUTPUTS

.10:' 010 6'0! 003

... 1 610 ! 003 ''''-

• 70 •

Three-Terminal SO Module

1130 ± 0.23

445 + 010

3.17 ± 0.64 125 ± 025 2.54 .1 0.25

100 ± 010

15.49 ~ 008

610 i 003 ~

L 7.75 ± 0.25 305 ± 010

SALES AND SERVICE

x

1537 + 0.76

605 ± 030

PANEl7

i m

8.89 350 REF

SOLDEf! COATED

TERMINALS (3)

~OUTPUT

MICRO SWITCH serves its customers through a worldwide network of sales

off ices and distributors. For application assistance, current specifications,

pricing or name of nearest Authorized

r

030 MAX A (4)

617 ... 003

t

_~ 6~7! 003 _. _ MQUNTING PLATE CUTOUT

MICRO STANDARD 3eTla3 BUTTON

11.68 ± 0,51 460 ± 020

15.67 .. 0,08

617 ^± -003

MOUNTING PLATE (BURR SIDE)

"--" 0,76 MAX R (4)

030

-115.67 + 0,08 1_. _

617 ± 003

MOUNTING PLATE CUTOUT

Distributor, contact a nearby MICRO SWITCH sales office. Or, contact:

MICRO SWITCH

Honeywell inc.

11 W. Spring Street

Freeport, Illinois 61032 Tel: 800-537-6945

MICRO SWITCH

a Honeywell Division

HelDinf! vou control vour world

SO ^Series

While we provide assistance on MICRO SWITCH products, personally and

through our literature, it is up to the

customer to determine the suitability of the product in the application.

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