DS2437S-3/T&R
DS2437S-3/T&R Datasheet
DS2437 Smart Battery Monitor
| Part | Datasheet |
|---|---|
DS2437S-3/T&R |
DS2437S-3/T&R (pdf) |
| Related Parts | Information |
|---|---|
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DS2437S/T&R |
DS2437S/T&R |
|
DS2437S |
DS2437S |
|
DS2437S-3 |
DS2437S-3 |
| PDF Datasheet Preview |
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| DS2437 Smart Battery Monitor Unique interface requires only one PIN ASSIGNMENT port pin for communication Provides unique 64-bit serial number to battery packs Eliminates thermistors by sensing battery temperature on-chip On-board A/D converter allows monitoring of battery voltage for end-of-charge and end-ofdischarge determination On-board integrated current accumulator VSENS+ VSENS- AGND 16 VDD 15 NC 14 NC 13 X1 12 NC 11 X2 10 NC 9 GND 16-PIN SSOP See Mech. Drawings Section facilitates gas gauging Real-time clock in binary format 40-byte nonvolatile user memory available for storage of user data such as gas gauge and manufacturing information Operating range -40°C to +85°C Applications include portable computers, portable/cellular phones, consumer electronics, and handheld instrumentation PIN DESCRIPTION - Data In/Out - General A/D input VSENS+ - Battery current monitor input + VSENS- - Battery current monitor input - - No connect - Digital Ground AGND - Analog Ground - Connection for kHz XTAL - Connection for kHz XTAL - Power Supply 2.7V to 10.0V The DS2437 Smart Battery Monitor provides several functions that are desirable to carry in a battery pack a means of tagging a battery pack with a unique serial number a direct-to-digital temperature sensor which eliminates the need for thermistors in the battery pack an A/D converter which measures the battery voltage and current an integrated current accumulator, which keeps a running total of all current going into and out of the battery a real-time clock and 40 bytes of nonvolatile EEPROM memory for storage of important parameters such as battery capacity, capacity remaining, and indication of battery cycling. Information is sent to/from the DS2437 over a 1-Wire interface, so that only one wire and ground needs to be connected from a central microprocessor to a DS2437. This means that battery packs need only have three output connectors battery power, ground, and the 1-Wire interface. Because each DS2437 contains a unique silicon serial number, multiple DS2437s can exist on the same 1-Wire bus. This allows multiple battery packs to be charged or used in the system simultaneously. 1 of 31 070600 DS2437 DETAILED PIN DESCRIPTION SYMBOL DESCRIPTION Data Input/Out for 1-Wire operation open drain VAD ADC Input for general purpose A/D VSENS+ Battery Input connection for battery current to be monitored see text VSENS- Battery Input connection for battery current to be monitored see text AGND Analog Ground must be at the same potential as GND |
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