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PDF MAX31826 Data sheet ( Hoja de datos )
| Número de pieza | MAX31826 | |
| Descripción | 1-Wire Digital Temperature Sensor | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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19-6264; Rev 0; 3/12
MAX31826
1-Wire Digital Temperature Sensor
with 1Kb Lockable EEPROM
General Description
The MAX31826 digital thermometer provides 12-bit
temperature measurements and communicates over a
1-WireM bus that by definition requires only one data line
(and ground) for communication with a central microcon-
troller. It has a -55NC to +125NC operating temperature
range and is accurate to Q0.5NC over the -10NC to +85NC
range. In addition, the device can derive power directly
from the data line (“parasite power”), eliminating the
need for an external power supply.
Each device has a unique 64-bit serial code, which
allows multiple devices to function on the same 1-Wire
bus. Therefore, it is simple to use one microcontroller
(the master device) to control many devices distributed
over a large area. The device includes 128 bytes (1Kb)
of EEPROM for storage of system data. The EEPROM
can be locked to permanently prevent any further data
writes. Four location address inputs simplify mapping of
individual devices to specific locations.
Applications
Industrial Systems
Building Automation
Consumer Equipment
System Calibration
Module Identification
Benefits and Features
S Unique 1-Wire Interface Requires Only One Port
Pin for Communication
S Integrated Temperature Sensor and EEPROM
Reduce Component Count
Measures Temperatures from -55NC to +125NC
(-67NF to +257NF)
±0.5NC Accuracy from -10NC to +85NC
12-Bit Temperature Resolution (0.0625NC)
1Kb EEPROM Can Be Locked to Prevent Further
Writes
S Multidrop Capability Simplifies Multisensor
Systems
Each Device Has a Unique 64-Bit Serial Code
Stored in On-Board ROM
Four Pin-Programmable Bits to Uniquely
Identify Up to 16 Sensor Locations on a Bus
S Can Be Powered from Data Line (3.0V to 3.7V
Power-Supply Range)
S 8-Pin µMAX® Package
www.DataSheet.co.kr
Ordering Information appears at end of data sheet.
For related parts and recommended products to use with this part,
refer to www.maxim-ic.com/MAX31826.related.
Block Diagram
VPU
4.7kΩ
DQ
GND
PARASITE-
POWER
CIRCUIT
CPP
64-BIT ROM
AND
1-Wire PORT
MEMORY
CONTROL LOGIC
1Kb
EEPROM
SCRATCHPAD 2
MAX31826
POWER-
VDD SUPPLY
SENSE
SCRATCHPAD 1
16-BIT TEMPERATURE REGISTER
8-BIT CRC GENERATOR
8-BIT CONFIGURATION REGISTER
ADDRESS PIN
INPUT LATCH
AD0 AD1 AD2 AD3
1-Wire and µMAX are registered trademarks of Maxim Integrated Products, Inc.
����������������������������������������������������������������� Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Datasheet pdf - http://www.DataSheet4U.net/
1 page  
MAX31826
1-Wire Digital Temperature Sensor
with 1Kb Lockable EEPROM
(VCC = 3.3V, TA = -40°C, unless otherwise noted.)
Typical Operating Characteristics
MAX31826 TYPICAL ERROR CURVE
0.5
0.4 +3s ERROR
0.3
0.2
MEAN ERROR
0.1
0
-0.1
-0.2
-0.3 -3s ERROR
-0.4
-0.5
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
TEMPERATURE (˚C)
www.DataSheet.co.kr
Pin Configuration
TOP VIEW
VDD 1
DQ 2
N.C. 3
GND 4
+
MAX31826
µMAX
8 AD3
7 AD2
6 AD1
5 AD0
Pin Description
PIN NAME
FUNCTION
1
VDD
Optional VDD. VDD must be grounded for
operation in parasite-power mode.
Data Input/Output. Open-drain 1-Wire
2
DQ
interface pin. Also provides power to
the device when used in parasite-power
mode (see the Parasite Power section.)
3 N.C. No Connection. Not internally connected.
4 GND Ground
5
AD0
Location Address Input (Least Significant
Bit)
6 AD1 Location Address Input
7 AD2 Location Address Input
8
AD3
Location Address Input (Most Significant
Bit)
����������������������������������������������������������������� Maxim Integrated Products 5
Datasheet pdf - http://www.DataSheet4U.net/
5 Page 
MAX31826
1-Wire Digital Temperature Sensor
with 1Kb Lockable EEPROM
BUS MASTER
Rx
Tx
OPEN-DRAIN
PORT PIN
VPU
4.7kΩ
Rx = RECEIVE
Tx = TRANSMIT
MAX31826 1-Wire PORT
DQ Rx
5µA
TYP
Tx
100Ω MOSFET
Figure 6. Hardware Configuration
The 1-Wire bus requires an external pullup resistor of
approximately 5kI; thus, the idle state for the 1-Wire bus
is high. If for any reason a transaction needs to be sus-
pended, the bus must be left in the idle state if the transac-
tion is to resume. Infinite recovery time can occur between
bits so long as the 1-Wire bus is in the inactive (high) state
during the recovery period. If the bus is held low for more
than 480Fs, all components on the bus are reset.
Transaction Sequence
The transaction sequence for accessing the device is as
follows:
1) Step 1: Initialization
2) Step 2: ROM Command (followed by any required
data exchange)
3) Step 3: MAX31826 Function Command (followed by
any required data exchange)
It is very important to follow this sequence every time the
device is accessed, as the device does not respond if
any steps in the sequence are missing or out of order.
An exception to this rule is the Search ROM command.
After issuing this ROM command, the master must return
to step 1 in the sequence.
Initialization
All transactions on the 1-Wire bus begin with an initializa-
tion sequence. The initialization sequence consists of a
reset pulse transmitted by the bus master followed by
presence pulse(s) transmitted by the slave(s). The pres-
ence pulse lets the bus master know that slave devices
(such as the MAX31826) are on the bus and are ready
to operate. Timing for the reset and presence pulses is
detailed in the 1-Wire Signaling section.
ROM Commands
After the bus master has detected a presence pulse, it
can issue a ROM command. These commands operate
onwww.DataSheet.co.kr the unique 64-bit ROM codes of each slave device
and allow the master to single out a specific device if
many are present on the 1-Wire bus. These commands
also allow the master to determine how many and what
types of devices are present on the bus. There are four
ROM commands, and each command is 8 bits long. The
master device must issue an appropriate ROM command
before issuing a MAX31826 function command. Figure 7
shows a flowchart for operation of the ROM commands.
Search ROM [F0h]
When a system is initially powered up, the master must
identify the ROM codes of all slave devices on the
bus, which allows the master to determine the number
of slaves and their device types. The master learns
the ROM codes through a process of elimination that
requires the master to perform a Search ROM cycle (i.e.,
Search ROM command followed by data exchange) as
many times as necessary to identify all the slave devices.
If there is only one slave on the bus, the simpler Read
ROM command can be used in place of the Search ROM
process. For a detailed explanation of the Search ROM
command procedure, refer to Application Note 937: Book
of iButton® Standards. After every Search ROM cycle,
the bus master must return to step 1 (initialization) in the
transaction sequence.
���������������������������������������������������������������� Maxim Integrated Products 11
Datasheet pdf - http://www.DataSheet4U.net/
11 Page | ||
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