DS1856E-002R datasheet(11/31 Pages) MAXIM

Part #	DS1856E-002R

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

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Dual, Temperature-Controlled Resistors with Inter-

nally Calibrated Monitors and Password Protection

____________________________________________________________________

11

Variable Resistors

The value of each variable resistor is determined by

a temperature-addressed look-up table, which can

assign a unique value (00h to FFh) to each resistor for

every 2°C increment over the -40°C to +102°C range

(see Table 3). See the Temperature Conversion section

for more information.

The variable resistors can also be used in manual

mode. If the TEN bit equals 0, the resistors are in man-

ual mode and the temperature indexing is disabled.

The user sets the resistors in manual mode by writing

to addresses 82h and 83h in Table 03 to control resis-

tors 0 and 1, respectively.

Memory Description

The memory of the DS1856 is divided into two areas

referred to as the Main Device and the Auxiliary

Device. The Main Device comprises all of the DS1856

specific memory while the Auxiliary Device consists of

128 bytes of general-purpose EEPROM and is espe-

cially useful in GBIC applications. Main and Auxiliary

ADEN

(ADDRESS

ENABLE)

NO. OF SEPARATE

DEVICE

ADDRESSES

ADDITIONAL

INFORMATION

02

See Figure 2

1

1 (Main Device Only)

See Figure 3

Table 4. ADEN Address Configuration

ADEN

ADFIX

AUXILIARY

ADDRESS

MAIN ADDRESS

00

A0h

A2h

01

A0h

EEPROM

(Table 03, 8Ch)

10

—

A2h

11

—

EEPROM

(Table 03, 8Ch)

Table 5. ADEN and ADFIX Bits

AUXILIARY DEVICE

EEPROM

AUXILIARY MEMORY

(128 BYTES)

00h

7Fh

127

7F

127

7F

128

80

183

B7

199

C7

200

C8

255

FF

2-WIRE ADDRRESS A0h

DEC HEX

00

MAIN DEVICE

LOWER MEMORY

TABLE SELECT BYTE

PASSWORD ENTRY

(PWE) (4 BYTES)

00h

7Fh

2-WIRE ADDRESS A2h (DEFAULT)

NOTE 1: ADEN BIT = 0. AUXILIARY MEMORY IS ADDRESSED USING THE AUXILIARY DEVICE

NOTE 1. 2-WIRE SLAVE ADDRESS OF A0h, AND THE REMAINDER OF THE MEMORY IS

NOTE 1. ADDRESSED USING THE MAIN DEVICE 2-WIRE SLAVE ADDRESS OF A2h

NOTE 1. (WHEN ADFIX = 0).

NOTE 2: TABLES 00h, 01h, AND 02h DO NOT EXIST.

DEC HEX

00

TABLE 03h

CONFIGURATION

TABLE

80h

B7h

TABLE 04h

RESISTOR 0

LOOK-UP TABLE

(72 BYTES)

80h

C7h

TABLE 05h

RESISTOR 1

LOOK-UP TABLE

(72 BYTES)

80h

C7h

RESERVED AND

CALIBRATION

CONSTANTS

RESERVED AND

CALIBRATION

CONSTANTS

F0h

FFh

F0h

FFh

Figure 2. Memory Organization, ADEN = 0

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