MAX1805：Multichannel Remote/Local Temperature Sensors _ BDTIC a Leading Distributor in China

MAX1805：Multichannel Remote/Local Temperature Sensors

The MAX1668/MAX1805/MAX1989 are precise multichannel digital thermometers that report the temperature of all remote sensors and their own packages. The remote sensors are diode-connected transistors—typically low-cost, easily mounted 2N3904 NPN types—that replace conventional thermistors or thermocouples. Remote accuracy is ±3°C for multiple transistor manufacturers, with no calibration needed. The remote channels can also measure the die temperature of other ICs, such as microprocessors, that contain an on-chip, diode-connected transistor. The 2-wire serial interface accepts standard system management bus (SMBus™) write byte, read byte, send byte, and receive byte commands to program the alarm thresholds and to read temperature data. The data format is 7 bits plus sign, with each bit corresponding to 1°C, in two's-complement format. The MAX1668/MAX1805/MAX1989 are available in small, 16-pin QSOP surface-mount packages. The MAX1989 is also available in a 16-pin TSSOP.

Key Features

Multichannel
- 4 Remote, 1 Local (MAX1668/MAX1989)
- 2 Remote, 1 Local (MAX1805)
No Calibration Required
SMBus 2-Wire Serial Interface
Programmable Under/Overtemperature Alarms
Supports SMBus Alert Response
Accuracy
- ±2°C (+60°C to +100°C, Local)
- ±3°C (-40°C to +125°C, Local)
- ±3°C (+60°C to +100°C, Remote)
3µA (typ) Standby Supply Current
700µA (max) Supply Current
Small, 16-Pin QSOP/TSSOP Packages

MAX1668, MAX1805, MAX1989: Typical Operating Circuit

Applications/Uses

Central Office Telecom Equipment
Desktop/Notebook Computers
Industrial Controls
LAN Servers
Multichip Modules
Test and Measurement Equipment

DataSheet

title	Download file
MAX1668-MAX1989 Data Sheet	MAX1668-MAX1989.pdf

Parametrics

Part Number	Sensor Type	Alarm Output	Functions	Interface	Channels	Accuracy (±°C)	Parasite Pwr.	Temp. Resolution (bits)	Oper. Temp. (°C)	Package/Pins	Budgetary Price
Part Number	Sensor Type	Alarm Output	Functions	Interface	Channels	Accuracy (±°C)	Parasite Pwr.	Temp. Resolution (bits)	Oper. Temp. (°C)	Package/Pins	See Notes
MAX1668	Remote	Alert	Remote & Local Sensor	2-Wire/I2C/SMBus	Four	2	No	8	-55 to +125	QSOP/16	$4.04 @1k
MAX1805					Two					QSOP/16	$3.35 @1k
MAX1989					Four					QSOP/16 TSSOP/16	$3.82 @1k

Design kits & evaluation modules

MAX1668EVSYS

Quality and Environmental Data

MAX1805.pdf

Ordering Information

Part Number	Status	Recommended Replacement	Package	Temp	RoHS
MAX1805MEE	No Longer Available	MAX1805MEE+	QSOP,;16 pin;30.9 mm²	-40°C to +85°C	No
MAX1805MEE+	Active		QSOP,;16 pin;30.9 mm²	-55°C to +125°C	Lead Free
MAX1805MEE+T	Active		QSOP,;16 pin;30.9 mm²	-40°C to +85°C	Lead Free
MAX1805MEE-T	No Longer Available	MAX1805MEE+T	QSOP;16 pin	-40°C to +85°C	See data sheet

MAX1668-MAX1989.pdf MAX1989

MAX1805.pdf MAX1805

MAX1668-MAX1989.pdf MAX1989