DS2438Z 데이터 시트보기 (PDF) - Dallas Semiconductor -> Maxim Integrated

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DS2438Z

Smart Battery Monitor

Dallas Semiconductor -> Maxim Integrated 

Temperature Register Format Table 1

DS2438

2-1 2-2 2-3 2-4 2-5

0

0

0 LSB

MSb

(unit = °C)

LSb

S

26

25

24

23

22

21 20 MSB

TEMPERATURE

+125°C

+25.0625°C

+0.5°C

0°C

-0.5°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 DS2438 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 DS2438 ADC is 0 volt to

10 volt; 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 10.23 volt, resulting in a resolution of

10 mV.

While the ADC has a range that extends down to 0 volt, it is important to note that the battery voltage can

also be the supply voltage to the DS2438. As such, the accuracy of the ADC begins to degrade below

battery voltages of 2.4 volt, and the ability to make conversions is limited by the operating voltage range

of the DS2438.

Voltage is expressed in this register in scaled binary format, as outlined in Table 2. Note that while codes

exist for values below 2.4 volt, accuracy of the ADC and the limitation on the DS2438’s supply voltage

make it unlikely that these values would be used in actual practice. See “Memory Map” section for the

Voltage Register address location.

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