DS1856E-030 datasheet(10/31 Pages) MAXIM

Part #	DS1856E-030

Description	Dual, Temperature-Controlled Resistors with Internally Calibrated Monitors and Password Protection

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Manufacturer	MAXIM [Maxim Integrated Products]

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Dual, Temperature-Controlled Resistors with Inter-

nally Calibrated Monitors and Password Protection

10

____________________________________________________________________

Monitored Signals

Each signal (VCC, MON1, MON2, MON3, and tempera-

ture) is available as a 16-bit value with 12-bit accuracy

(left-justified) over the serial bus. See Table 1 for signal

scales and Table 2 for signal format. The four LSBs

should be masked when calculating the value. The 3

LSBs are internally masked with 0s.

The signals are updated every frame rate (tframe) in a

round-robin fashion.

The comparison of all five signals with the high and low

user-defined values are done automatically. The corre-

sponding flags are set to 1 within a specified time of

the occurrence of an out-of-limit condition.

Calculating Signal Values

The LSB = 100µV for VCC, and the LSB = 38.147µV for

the MON signals when using factory default settings.

To calculate VCC, convert the unsigned 16-bit value to

decimal and multiply by 100µV.

To calculate MON1, MON2, or MON3, convert the

unsigned 16-bit value to decimal and multiply by

38.147µV.

To calculate the temperature, treat the two’s comple-

ment value binary number as an unsigned binary num-

ber, then convert to decimal and divide by 256. If the

result is greater than or equal to 128, subtract 256 from

the result.

Temperature: high byte: -128

°C to +127°C signed; low

byte: 1/256

°C.

SIGNAL

+FS

SIGNAL

+FS

(hex)

-FS

SIGNAL

-FS

(hex)

Temperature +127.984

°

7FFC

-128

°C

8000

VCC

6.5528V

FFF8

0V

0000

MON1

2.4997V

FFF8

0V

0000

MON2

2.4997V

FFF8

0V

0000

MON3

2.4997V

FFF8

0V

0000

Table 1. Scales for Monitor Channels at

Factory Setting

SIGNAL

FORMAT

VCC

Unsigned

MON1

Unsigned

MON2

Unsigned

MON3

Unsigned

Temperature

Two’s complement

Table 2. Signal Comparison

TEMPERATURE

(°C)

CORRESPONDING LOOK-UP

TABLE ADDRESS

<-40

80h

-40

80h

-38

81h

-36

82h

-34

83h

——

+98

C5h

+100

C6h

+102

C7h

>+102

C7h

Table 3. Look-Up Table Address for

Corresponding Temperature Values

MSB

215

214

213

212

211

210

29

28

LSB

27

26

25

24

23

22

21

20

MSB (BIN)

LSB (BIN)

VOLTAGE (V)

10000000

3.29

11000000

11111000

4.94

S26

25

24

23

22

21

20

2-1

2-2

2-3

2-4

2-5

2-6

2-7

2-8

MSB (BIN)

LSB (BIN)

TEMPERATURE (

°C)

01000000

00000000

+64

01000000

00001111

+64.059

01011111

00000000

+95

11110110

00000000

-10

11011000

00000000

-40

MSB (BIN)

LSB (BIN)

VOLTAGE (V)

11000000

00000000

1.875

10000000

1.255

Monitor/VCC Bit Weights

Temperature Bit Weights

Monitor Conversion Example

VCC Conversion Examples

Temperature Conversion Examples

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