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Part: CS2516KD8
Category:
Power Management
-> Battery Management
Description: Pulse-load Battery Monitor
Company: Cherry Semiconductor (acquired by ON Semiconductor)
Datasheet: Download CS2516KD8 datasheet File size : 243 kB
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Datasheet text preview:
CS2516
CS2516
Pulse-Load Battery Monitor
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. 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 permits low battery alarm devices or visible annunciators to be driven directly by the IC. The maximum permissible output current is 30mA.
Features
s Adjustable Battery Sense from 7 to 12 Volts s Pulse Loads Battery at up to 50mA s Standby Current Under 10µA s Test Period, Rate and Load Adjustable s On Chip 15mA Output Driver
Block Diagram
Package Options
8L PDIP and 8L SO
Rp
VCC
RP 1 SENSE 2 CT 3
8 7 6 5
VCC PW OUT Load Switch
SENSE
PW
COM
4
CT Cycle Timer
OUT
COM
Load Switch
Cherry Semiconductor Corporation 2000 South County Trail, East Greenwich, RI 02818 Tel: (401)885-3600 Fax: (401)885-5786 Email: info@cherry-semi.com Web Site: www.cherry-semi.com
Rev. 1/17/95
1
A
¨
Company
CS2516
Absolute Maximum Ratings Supply Voltage (VCC) ......0 to 14V Rp Input Voltage ...-0.5 to VCC SENSE, CT, PW, Output and Load Switch...........-0.5 to 8V Load Current.........50mA Output Current ....30mA Storage Temperature.......-40 to +150ûC Lead Temperature Soldering: Wave Solder (through hole styles only).........10 sec. max, 260¡C peak Reflow (SMD styles only) .........60 sec. max above 183¡C, 230¡C peak
Electrical Characteristics: VCC = 9V, Rp = 9.1 M½, CT = 4.7µF, Cpw = 0.1µF, Rpw = 10M½, 0¡ ² TA ² 85¡ unless otherwise specified.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
s VCC Operating Voltage Standby Current s Cycle Timer Charge Current Discharge Current Discharge Impedance Upper Charge Threshold Lower Charge Threshold Lower Discharge Threshold s Load Switch ÒONÓ Voltage ÒOFFÓ Current s Sense Input Threshold Voltage Threshold Temp Coefficient Active Impedance s Pulse Stretcher Source Current Schmitt Upper Threshold Hysteresis Input Bias Current s Output Switch ÒONÓ Voltage ÒOFFÓ Current VPW = 3V; IOUT = 15mA VPW = 0V; VOUT = 12V 0.1 0.5 1.0 V µA VSENSE=7.1V, VPW=1.2V VSENSE = 6.3V, VPW = 0V VCC=VSENSE=6.3V, VPW = 0V -950 -300 2.25 0.60 -550 -250 2.50 1.00 -250 -200 2.75 1.40 1.00 µA µA V V µA 0¡C < TA < 85¡C 5.0 6.3 6.7 150 8.5 12.0 7.1 V ppm/¡C k½ ILoad Switch = 50mA VLoad Switch = 12V 0.3 0.5 1.0 V µA VCT=0V, 6V²VCC²12V 2V ² VCT < 7.5V VCT= 8.8V VCT= 2.0V 4.6V < VCT< 8.0V -0.48µA < ICT < -1.70µA -0.48µA < IC < -1.70µA 1.1mA < IC< 25mA 7.0 0.5 2.0 -1.70 -0.77 8.0 1.1 -1.20 -0.74 20.0 3.0 440 8.0 1.0 4.6 9.0 3.0 6.0 -0.48 -0.71 25.0 3.6 µA µA mA mA ½ V V V 9 4 12 10 V µA
2
CS2516
Electrical Characteristics: VCC = 9V, RP = 9.1 M½, CT = 4.7µF, Cpw = 0.1µF, Rpw = 10M½, 0¡ ² TA ² 85¡ unless otherwise specified
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
s Recommended Component Values Rp Program Resistor CT Cycle Timer Capacitor CPW Pulse Stretcher Capacitor RPW Pulse Stretcher Resistor Package Pin Description
PACKAGE PIN # PIN SYMBOL FUNCTION
1.0 4.7 0.01 1
9.1 22.0 0.10 10
M½ µF µF M½
8L PDIP & SO Narrow 1 2 3 4 5 6 7 8 RP SENSE CT COM Load Switch OUT PW VCC Test period programming resistor. Voltage sense comparator input. Test period, duration programming capacitor. Common negative Collector of pulse loading NPN transistor. Alarm Pulse width-stretcher output Output pulse-width programming RC. Power source.
Typical Performance Characteristics CT Discharge Impedance vs CT Voltage (Typ +25¡C)
1000 900 Impedance, W 800 700 600 500 400
8.8
8.0
7.0
6.0 5.0 4.0 CT Voltage
3.0
2.0
1.0
Timing Diagram
VCC 7.1V 8V CT 1V VCC Tp Vsat Td PW OUT 0V Tpw VCC BATT. OK Vsat BATT. LOW 1ms 2.5V 1.5V 510ms VCC 0V 4.6V 1.14ms 1V 1V VCC 33S Tt 6.7V VCC
Load Switch
3
CS2516
Applications Formulae and Typical Values Program and Standby Currents: IP = Cycle Timer Period: Tt = VCC = RP 9V 9.1m½ Å 1µA Standby Current = 4IP = 4µA (typ.)
VTCT 7CT 7 x 4.7µF = = Å 33sec., IP 1µA 1µA
where Vt = Upper Charge Threshold - Lower Charge Threshold (7V typ.) Test Pulse Width: Tp = RdCT x ln(VP) Å 242CTÅ 242 x 4.7µF Å 1.14ms where Rd is the dynamic cycle timer discharge impedance (440½ typ.) and VP = Upper Charge Threshold Lower Discharge Threshold [1n(VP) = 0.55 typ.]
Pulse Stretcher: Delay Time: TD =
VdCPW 2.5CPW 2.5 x 0.1µF = = Å 1ms 250µA Isrc 250µA
where Vd = Schmitt Trigger Upper Threshold (2.5V typ.) and Isrc = Typical source current at the PW pin at the nominal low battery sense threshold of 6.7V. Pulse Width: Tp = CPWRPW ln(VS) Å 0.51 x 0.1µF x 10m½ Å 510ms. and VS = Schmitt Trigger Upper Threshold Schmitt Trigger Hysteresis Applications Information The value of Rp affects standby current, operating current, and the test cycle period. The recommended value is (V+/1µA) where V+ is the fresh battery voltage. Higher values of Rp are not recommended. Minimum recommended value is (V+/10µA) which will increase both the standby and operating currents by 10X and reduce the test cycle period by the same factor; the test pulse width will be unaffected. The value of Ct affects both the test cycle period and the test pulse width. Of critical importance is the selection of a low leakage type capacitor; if leakage current exceeds the cycle timer charge current, the timer will not operate. The pulse stretcher components RPW and CPW should be selected such that the delay timer to charge CPW is shorter than the test pulse width programmed by Ct to guarantee operation of the Output. The output is an open-collector transistor which may be used to drive an indicator device directly or to interface to logic family devices. The SENSE input typical 8.5k½ input impedance appears only during the test pulse; otherwise the SENSE input is in a high impedance state. The effective low battery threshold voltage can be modified (increased only) by means of a voltage divider placed across the load resistor. This technique can also be used to effectively reduce the threshold tolerance band. [ln(VS) = 0.51 typ.]
Typical Application Circuit
Rp 9.1MW Rp VCC
VCC Cpw
SENSE CT
PW
0.1mF Rpw
CS2516
+ CT OUT
10MW 510W
4.7mF COM Load Switch
220W + 9V
4
CS2516
Increased Pulse-Load Current Capability
Rp 9.1MW Rp VCC Cpw SENSE CT PW 0.1mF Rpw 9V
+
CS2516
+ CT OUT
10MW OUT 820W
4.7mF COM Load Switch 220W
RL
12V Battery Application with 9V Threshold
Rp 9.1MW Rp VCC Cpw SENSE CT PW 0.1mF Rpw
51W 12V
+
CS2516
+ CT OUT
10MW OUT 150W
4.7mF COM Load Switch
Adjustable Sense Threshold
200W Rp 9.1MW Rp VCC Cpw SENSE CT PW 0.1mF Rpw 9V +
CS-2516
+ CT OUT
10MW OUT 1.8kW RL 220W
4.7mF COM Load Switch
5
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