DS28EA00U+ Maxim Integrated Products, DS28EA00U+ Datasheet - Page 8

• 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

1-Wire Digital Thermometer with
Sequence Detect and PIO
Table 1. Temperature/Data Relationship
The temperature reading is in °C using a 16-bit sign-
extended two’s complement format. Table 1 shows
examples of temperature and the corresponding data
for 12-bit resolution. With two’s complement, the sign
bit(s) is set if the value is negative. If the device is con-
figured for 12-bit resolution, all bits in the LS byte are
valid; for a reduced resolution, bit 0 (11-bit mode), bits
0 to 1 (10-bit mode), and bits 0 to 2 (9-bit mode) are
undefined.
The result of a temperature conversion is automatically
compared to the values in the alarm registers to deter-
mine whether an alarm condition exists. Alarm thresh-
* The power-on reset value of the Temperature Readout register is +85°C.
8
ADDRRESS
ADDRRESS
_______________________________________________________________________________________
0h
1h
2h
3h
TEMPERATURE
+25.0625
+10.125
-25.0625
BIT 7
-10.125
BIT 7
+85*
+0.5
2
(°C)
S
S
-0.5
S
-40
3
0
BIT 6
BIT 6
2
2
2
S
6
6
2
BIT 5
BIT 5
2
2
2
S
5
5
1
BIT 4
BIT 4
0000 0101 0101 0000
0000 0001 1001 0001
0000 0000 1010 0010
0000 0000 0000 1000
0000 0000 0000 0000
1111 1111 1111 1000
1111 1111 0101 1110
1111 1110 0110 1111
1111 1101 1000 0000
2
2
2
S
0
4
4
DIGITAL OUTPUT
(BINARY)
BIT 3
BIT 3
2
2
2
S
-1
olds are represented as two’s complement number.
With 8 bits available for sign and value, alarm thresh-
olds can be set in increments of 1°C. An alarm condi-
tion exists if a temperature conversion results in a value
that is either higher than or equal to the value stored
in the TH register or lower than or equal to the value
stored in the TL register. If a temperature alarm condi-
tion exists, the device responds to the Conditional
Search ROM command. The alarm condition is cleared
if a subsequent temperature conversion results in a
temperature reading within the boundaries defined by
the data in the TH and TL registers.
3
3
Temperature Readout Register Bitmap
Register Detailed Descriptions
Temperature Alarm Registers Bitmap
BIT 2
BIT 2
2
2
2
2
-2
2
2
6
BIT 1
BIT 1
2
2
2
2
-3
1
1
5
DIGITAL OUTPUT
BIT 0
BIT 0
2
2
2
2
-4
0
0
4
00A2h
FF5Eh
FE6Fh
FD80h
(HEX)
0550h
0191h
0008h
0000h
FFF8h
LS BYTE
MS BYTE
HIGH ALARM (TH)
LOW ALARM (TL)