CS2516

Features:

· Adjustable Battery Sense from 7 to 12 Volts
· Pulse Loads Battery at up to 50mA
· Standby Current Under 10µA
·Test Period, Rate and Load Adjustable
· On Chip 15mA Output Driver


Pinout




Specifications

Supply Voltage, V_CC.................................................................................................................17V
Operating Temperature Range .................................................................................-40 to 70
Junction Temperature ..........................................................................................................150
Storage Temperature Range ..................................................................................-60 to 150
Lead Temperature Soldering Wave Solder (through hole styles only) ...10 sec. max, 260 peak
Reflow (SMD styles only) ...................................................60 sec. max above 183, 230 peak


Description

The CS2516 is designed for use in battery powered medical, security, or environmental systems where prior notification of impending power source failure is a requirement. The IC effectively provides continuous monitoring of battery condition by pulsesampling the system voltage at predetermined intervals. Low standby current permits unswitched connection to the battery with minimal impact on operating life. The ability to load the battery during the test pulse provides assurance that sufficient reserve capacity exists to operate critical system components.

The CS2516 contains an internal timer that generates a 1.0 millisecond test pulse once each 33 seconds (both times are typical). The load switch transistor conducts only during the test pulse, and can sink up to 50mA directly. An external transistor can be added to increase the load current capability.

CS2516 Should, during the test pulse, the sense terminal voltage fall below the threshold level determined by the internal (synthesized) temperature compensated zener diode, the comparator will permit a charging current to flow out of PW. This pin is also the input of a Schmitt trigger that in turn drives the output transistor. Collectively, the charge current and trigger, in conjunction with an external RC network, operate as a Òpulse-stretcherÓ to provide output ÒONÓ times that are a multiple of the sampling time. This feature of CS2516 permits low battery alarm devices or visible annunciators to be driven directly by the IC. The maximum permissible output current is 30mA.