DS28EA00U+ Maxim Integrated Products, DS28EA00U+ Datasheet - Page 28

• 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
28
______________________________________________________________________________________
For the sequence discovery to function properly, the logic state at PIOB (EN) must not change during the transmission of
the Conditional Read ROM command code, and, if the device responds, must stay at logic 0 until the entire 64-bit regis-
tration number is transmitted.
PIO Access Write (Invalid Data Byte)
The PIO Access Write command is ignored by the device while in chain ON or chain DONE state.
Change Chain State (Success)
Change Chain State (Transmission Error)
Change Chain State (Invalid Control Byte)
Sequence Discovery Example
RST
RST
RST
RST
RST
RST PD
RST PD
RST PD
RST PD
PD SELECT
PD SELECT CHAIN
PD SELECT
PD SELECT
PD
GND
N.C.
N.C.
IO
SKIPR
CDRR
CDRR
CDRR
SKIPR
1
2
3
4
+
CHAIN
CHAIN
CHAIN
Chain <3Ch> <C3h> <AAh>
<Registration Number>
<Registration Number>
DS28EA00
<8 Bytes FFh>
μSOP
PIOW
Pin Configuration
<5Ah> <A5h>
<Chain Control Byte>
<Invalid Control Byte> <Inverted Previous Byte>
<Any Byte>
<PIO Output Data>
8
7
6
5
No response: all devices have
been discovered
V
PIOB
PIOA
N.C.
DD
<Byte ≠ Inverted Previous Byte>
1-Wire Communication Examples (continued)
CHAIN
CHAIN <96h> <69h>
Wait for chain to charge
<Chain Control Byte>
<Invalid Data Byte>
<96h> <69h>
Put all devices into chain OFF state.
For the latest package outline information and land patterns, go
to www.maxim-ic.com/packages.
PACKAGE TYPE
8 µSOP
<AAh>
<AAh>
<AAh>
AA Loop
FF Loop
00 Loop
xx Loop
Identify the first device and
put it into chain DONE state.
Identify the next device and
put it into chain DONE state.
Repeat this sequence until
no device responds.
Put all devices into
chain ON state.
PACKAGE CODE
Package Information
U8+1
DOCUMENT NO.
21-0036