DS1854E-050 datasheet(9/22 Pages) MAXIM

Part #	DS1854E-050

Description	Dual Temperature-Controlled Resistors with Two Monitors

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Manufacturer	MAXIM [Maxim Integrated Products]

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Dual Temperature-Controlled Resistors with

Two Monitors

_____________________________________________________________________

9

Monitored Signals

Each signal (VCC, MON1, MON2, and temperature) is

available as a 16-bit value with 12-bit accuracy (left-jus-

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

round-robin fashion.

The comparison of all four 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.

To calculate the value of VCC, convert the unsigned 16-

bit value to decimal and multiply by 100µV.

To calculate the value of MON1 or MON2, convert the

unsigned 16-bit value to decimal and multiply by

38.147µV.

To calculate the value of the temperature, treat the

two’s complement value binary number as an unsigned

binary number then convert to decimal and divide by

256. If the result is greater than or equal to 128, then

subtract 256 from the result.

Temperature: high byte: -128

°C to +127°C signed; low

byte: 1/256

°C.

SIGNAL

+FS

SIGNAL

+FS

-FS

SIGNAL

-FS

Temperature

127.996

°C

7FFF

-128

°C

8000

VCC

6.55V

FFFF

0V

0000

MON1

2.5V

FFFF

0V

0000

MON2

2.5V

FFFF

0V

0000

Table 1. Scales for Monitor Channels

SIGNAL

FORMAT

VCC

Unsigned

MON1

Unsigned

MON2

Unsigned

Temperature

Two’s complement

Table 2. Signal Comparison

TEMPERATURE

CORRESPONDING LOOK-UP

TABLE ADDRESS

<-40

°C

80h

-40

°C

80h

-38

°C

81h

-36

°C

82h

-34

°C

83h

——

+98

°C

C5h

+100

°C

C6h

+102

°C

C7h

>+102

°C

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

Temperature Conversion Example

VCC Conversion Example

Monitor Conversion Example

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