DS2437S/T&R datasheet, PDF - EEWORLD Datasheet

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DS2437S/T&R: DescriptionIC monitor smart battery 16-ssop; Categorysemiconductor Power management; File Size1MB，31 Pages; ManufacturerMaxim; Websitehttps://www.maximintegrated.com/en.html

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DS2437S/T&R Overview

IC monitor smart battery 16-ssop

DS2437S/T&R Parametric

Parameter Name	Attribute value
Datasheets
DS2437
Product Photos
16-SSOP
Standard Package	1,000
Category	Integrated Circuits (ICs)
Family	PMIC - Battery Manageme
Packaging	Tape & Reel (TR)
Functi	Battery Moni
Battery Chemistry	Smart Batteries
Voltage - Supply	2.7 V ~ 10 V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mou
Package / Case	16-SSOP (0.209", 5.30mm Width)
Supplier Device Package	16-SSOP

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DS2437

Smart Battery Monitor

www.dalsemi.com

FEATURES

Unique 1-Wire interface requires only one

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-of-

discharge determination

On-board integrated current accumulator

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 ASSIGNMENT

VAD

VSENS+

VSENS-

AGND

VDD

GND

16-PIN SSOP

See Mech. Drawings Section

PIN DESCRIPTION

VAD

VSENS+

VSENS-

GND

AGND

- Data In/Out

- General A/D input

- Battery current monitor input (+)

- Battery current monitor input (-)

- No connect

- Digital Ground

- Analog Ground

- Connection for 32.768 kHz XTAL

- Power Supply (2.7V to 10.0V)

DESCRIPTION

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

OPERATION – MEASURING TEMPERATURE

The DS2437 measures temperatures through the use of an onboard proprietary temperature measurement

technique.

The temperature reading is provided in a 13-bit, two’s complement reading, which provides 0.03125°C of

resolution. Table 1 describes the exact relationship of output data to measured temperature. The data is

transmitted serially over the 1-Wire interface. The DS2437 can measure temperature over the range of

-55°C to +125°C in 0.03125°C increments. For Fahrenheit usage, a lookup table or conversion factor

must be used.

Note that temperature is represented in the DS2437 in terms of a 0.03125°C LSb, yielding the following

13-bit format. The 3 least significant bits of the temperature register will always be 0. The remaining 13

bits contain the two’s complement representation of the temperature in

°C,

with the MSb holding the sign

(S) bit. See “Memory Map” section for the TEMPERATURE REGISTER address location.

Temperature/Data Relationships

Table 1

TEMPERATURE

+125°C

+25.0625°C

+1/2°C

0°C

-1/2°C

-25.0625°C

-55°C

DIGITAL OUTPUT (Binary)

01111101 00000000

00011001 00010000

00000000 10000000

00000000 00000000

11111111 10000000

11100110 11110000

11001001 00000000

DIGITAL OUTPUT (Hex)

7D00h

1910h

0080h

0000h

FF80h

E6F0h

C900h

OPERATION – MEASURING BATTERY VOLTAGE

The on-board analog-to-digital converter (ADC) has 10 bits of resolution and will perform a conversion

when the DS2437 receives a command protocol (Convert V) instructing it to do so. The result of this

measurement is placed in the 2-byte VOLTAGE REGISTER. The range for the DS2437 ADC is 0V to

10V; this range is suitable for NiCd or NiMH battery packs up to six cells and for lithium ion battery

packs of two cells. The full-scale range of the ADC is scaled to 10.23V, resulting in a resolution of 10

mV.

While the ADC has a range that extends to 0V, it is important to note that the battery voltage can also be

the supply voltage to the DS2437. As such, the accuracy of the ADC begins to degrade below battery

voltages of 2.7V, and the ability to make conversions is limited by the operating voltage range of the

DS2437.

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DS2437S/T&R Related Products

	DS2437S/T&R	DS2437S	DS2437S-3	DS2437S-3/T&R	DS2437S/T&R;	DS2437S-3/T&R;
Description	IC monitor smart battery 16-ssop	IC monitor smart battery 16-ssop	IC monitor smart battery 16-ssop	IC monitor smart battery 16-ssop	IC MONITOR SMART BATTERY 16-SSOP	IC MONITOR SMART BATTERY 16-SSOP
Standard Package	1,000	1	1	1,000	-	-
Category	Integrated Circuits (ICs)	Integrated Circuits (ICs)	Integrated Circuits (ICs)	Integrated Circuits (ICs)	-	-
Family	PMIC - Battery Manageme	PMIC - Battery Manageme	PMIC - Battery Manageme	PMIC - Battery Manageme	-	-
Packaging	Tape & Reel (TR)	Tube	Tube	Tape & Reel (TR)	-	-
Functi	Battery Moni	Battery Moni	Battery Moni	Battery Moni	-	-
Battery Chemistry	Smart Batteries	Smart Batteries	Smart Batteries	Smart Batteries	-	-
Voltage - Supply	2.7 V ~ 10 V	2.7 V ~ 10 V	2.7 V ~ 10 V	2.7 V ~ 10 V	-	-
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-	-
Mounting Type	Surface Mou	Surface Mou	Surface Mou	Surface Mou	-	-
Package / Case	16-SSOP (0.209", 5.30mm Width)	16-SSOP (0.209", 5.30mm Width)	16-SSOP (0.209", 5.30mm Width)	16-SSOP (0.209", 5.30mm Width)	-	-
Supplier Device Package	16-SSOP	16-SSOP	16-SSOP	16-SSOP	-	-

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