DS1856E-030+T&R Maxim Integrated Products, DS1856E-030+T&R Datasheet - Page 11

• Manufacturer Part Number: DS1856E-030+T&R
• Description: IC RES TEMP-CNTRL 30/10K 16TSSOP
• Manufacturer: Maxim Integrated Products

Specifications of DS1856E-030+T&R

• Taps: 256
• Resistance (ohms): 10K, 30K
• Number Of Circuits: 2
• Temperature Coefficient: 50 ppm/°C Typical
• Memory Type: Non-Volatile
• Interface: I²C, 2-Wire Serial
• Voltage - Supply: 2.85 V ~ 5.5 V
• Operating Temperature: -40°C ~ 95°C
• Mounting Type: Surface Mount
• Package / Case: 16-TSSOP
• Resistance In Ohms: 10K, 30K
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Table 4. ADEN Address Configuration
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.
Figure 2. Memory Organization, ADEN = 0
nally Calibrated Monitors and Password Protection
DEC HEX
127
Dual, Temperature-Controlled Resistors with Inter-
0
(ADDRESS
ENABLE)
ADEN
7F
0
0
1
00h
2-WIRE ADDRRESS A0h
AUXILIARY MEMORY
AUXILIARY DEVICE
(128 BYTES)
EEPROM
1 (Main Device Only)
NO. OF SEPARATE
ADDRESSES
7Fh
DEVICE
2
Variable Resistors
DEC HEX
128
183
199
200
127
255
0
C8
B7
C7
7F
80
FF
____________________________________________________________________
0
INFORMATION
ADDITIONAL
See Figure 2
See Figure 3
2-WIRE ADDRESS A2h (DEFAULT)
00h
TABLE SELECT BYTE
PASSWORD ENTRY
LOWER MEMORY
(PWE) (4 BYTES)
MAIN DEVICE
7Fh
NOTE 1: ADEN BIT = 0. AUXILIARY MEMORY IS ADDRESSED USING THE AUXILIARY DEVICE
NOTE 1.
NOTE 1.
NOTE 1.
NOTE 2: TABLES 00h, 01h, AND 02h DO NOT EXIST.
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.
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
Table 5. ADEN and ADFIX Bits
80h
CONFIGURATION
ADEN
TABLE 03h
0
0
1
1
2-WIRE SLAVE ADDRESS OF A0h, AND THE REMAINDER OF THE MEMORY IS
ADDRESSED USING THE MAIN DEVICE 2-WIRE SLAVE ADDRESS OF A2h
(WHEN ADFIX = 0).
TABLE
B7h
ADFIX
0
1
0
1
80h
F0h
LOOK-UP TABLE
RESERVED AND
CALIBRATION
CONSTANTS
RESISTOR 0
TABLE 04h
(72 BYTES)
AUXILIARY
ADDRESS
A0h
A0h
—
—
Memory Description
C7h
FFh
80h
F0h
LOOK-UP TABLE
RESERVED AND
MAIN ADDRESS
CALIBRATION
RESISTOR 1
CONSTANTS
(Table 03, 8Ch)
(Table 03, 8Ch)
TABLE 05h
(72 BYTES)
EEPROM
EEPROM
A2h
A2h
C7h
FFh
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