RE46C160 查看數據表（PDF） - R and E International, Inc.

零件编号

产品描述 (功能)

比赛名单

RE46C160

CMOS Alarm ASIC

R and E International, Inc. 

RE46C160

CMOS Alarm ASIC

Preliminary Product Specification

R&E International

DEVICE DESCRIPTION and APPLICATION NOTES

Note: All timing references are nominal values. Refer to the electrical specifications for limits

Internal Timing – With external components as indicated on the application drawing the period of the

oscillator is 1.67 seconds in standby. Every 1.66 seconds the detection circuitry is powered up for

10.5mS and the status of the detect comparator is latched. In addition every 40 seconds the LED driver is

turned on for 10.5mS and the status of the low battery comparator is latched. The detect comparator

status is not checked during the low battery test, during the low battery horn warning chirp, or when the

horn is on due to an alarm condition.

If an alarm condition is detected the oscillator period increases to 41.5mS.

Due to the low currents used in the oscillator the capacitor on pin 12 should be a low leakage type.

Oscillator accuracy will depend mainly on the tolerance of the RBIAS resistor and OSCAP capacitor.

Alarm Circuit – The alarm comparator compares the alarm voltage to a voltage derived from a resistor

divider across VDD. . This divider voltage must be provided externally on pin 13 (VSEN). See the

application drawing (FIG 2). In an alarm condition the horn is turned on for 167mS and turned off for

87ms.

The guard amplifier and outputs are always active and will be within 50mV of the DETECT input. The

guard outputs also allow for measurement of the DETECT input without loading the sensing element.

Low Battery Detection – An internal reference is compared to the voltage divided VDD supply. The

battery can be checked under load via the LED low side driver output since low battery status is latched

at the end of the 10mS LED pulse. Pin 3 (LBADJ) can be used to modify the low battery set point by

placing a resistor to VDD or VSS.

LED Pulse – The LED is pulsed on for 10.5mS every 40S in standby. In alarm the LED is pulsed on for

10.5mS every 1S.

Testing – By holding pin 12 (OSCAP) low the internal power strobe is active and pins 1 (DETCOMP) and

4 (LBCOMP) can be used to check for alarm and low battery respectively. Please refer to the timing

diagrams.

Telephone 610.992.0727

Facsimile 610.992.0734

E-mail: rande@randeint.com

Page 4 of 7

DS-RE46C160-070904

This datasheet contains PROPRIETARY and CONFIDENTIAL information.

Share Link: