DS28EA00U+ Maxim Integrated Products, DS28EA00U+ Datasheet - Page 7

• Manufacturer Part Number: DS28EA00U+
• Description: IC THERMOMETER 1-WIRE 8-USOP
• Manufacturer: Maxim Integrated Products

Specifications of DS28EA00U+

• Function: Thermometer, Thermostat
• Topology: Register Bank, Scratchpad
• Sensor Type: Internal
• Sensing Temperature: -40°C ~ 85°C
• Output Type: Digital
• Output Alarm: Yes
• Output Fan: No
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Maximum Operating Temperature: + 85 C
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Figure 2. 64-Bit Registration Number
Figure 3. 1-Wire CRC Generator
The memory map of the DS28EA00 is shown in Figure 4.
It consists of an 8-byte scratchpad and 3 bytes of back-
up EEPROM. The first 2 bytes form the Temperature
Readout register, which is updated after a temperature
conversion and is read only. The next 3 bytes are user-
writable; they contain the Temperature High (TH) and the
Temperature Low (TL) Alarm register and a Configuration
register. The remaining 3 bytes are “reserved.” They
Figure 4. Memory Map
X
0
MSB
MSB
STAGE
1ST
CRC CODE
X
1
8-BIT
_______________________________________________________________________________________
STAGE
2ND
*POWER-UP STATE DEPENDS ON VALUE(S) STORED IN EEPROM.
ADDRESS
BYTE
LSB
X
0
1
2
3
4
5
6
7
2
MSB
STAGE
Memory Description
3RD
SCRATCHPAD (POWER-UP STATE)
TH REGISTER OR USER BYTE 1*
TL REGISTER OR USER BYTE 2*
CONFIGURATION REGISTER*
X
TEMPERATURE MSB (05h)
TEMPERATURE LSB (50h)
3
1-Wire Digital Thermometer with
RESERVED (FFh)
RESERVED (0Ch)
RESERVED (10h)
STAGE
4TH
POLYNOMIAL = X
48-BIT SERIAL NUMBER
Sequence Detect and PIO
X
4
8
+ X
5
STAGE
power up with constant data and cannot be written by
the user. The TH, TL, and Configuration register data in
the scratchpad control the resolution of a temperature
conversion and decide whether a temperature is consid-
ered as “alarming.” TH, TL, and Configuration can be
copied to the EEPROM to become nonvolatile. The
scratchpad is automatically loaded with EEPROM data
when the DS28EA00 powers up.
5TH
+ X
4
+ 1
TH REGISTER OR USER BYTE 1
TL REGISTER OR USER BYTE 2
CONFIGURATION REGISTER
BACKUP EEPROM
X
5
STAGE
N/A
N/A
N/A
N/A
N/A
6TH
LSB
X
6
MSB
STAGE
7TH
8-BIT FAMILY CODE
(42h)
X
INPUT DATA
7
STAGE
8TH
LSB
LSB
X
8
7