Rainbow Electronics MAX1619 - Manual

________________General Description
The MAX1619 is a precise digital thermometer that reports
the temperature of both a remote sensor and its own
package. The remote sensor is a diode-connected transis-
tor—typically a low-cost, easily mounted 2N3904 NPN
type—that replaces conventional thermistors or thermo-
couples. Remote accuracy is ±3°C for multiple transistor
manufacturers, with no calibration needed. The remote
channel 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. Measurements can be done
automatically and autonomously, with the conversion rate
programmed by the user or programmed to operate in a
single-shot mode. The adjustable rate allows the user to
control the supply-current drain.
The MAX1619 is nearly identical to the popular MAX1617A,
with the additional feature of an overtemperature alarm out-
put (OVERT) that responds to the remote temperature; this
is optimal for fan control.
________________________Applications
Desktop and Notebook Central Office
Computers Telecom Equipment
Smart Battery Packs Test and Measurement
LAN Servers Multichip Modules
Industrial Controls
____________________________Features
♦ Two Channels Measure Both Remote and Local
Temperatures
♦ No Calibration Required
♦ SMBus 2-Wire Serial Interface
♦ Programmable Under/Overtemperature Alarms
♦ OVERT
Output for Fan Control
♦ Supports SMBus Alert Response
♦ Supports Manufacturer and Device ID Codes
♦ 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
♦ 70µA (max) Supply Current in Auto-Convert Mode
♦ +3V to +5.5V Supply Range
♦ Write-Once Protection
♦ Small 16-Pin QSOP Package
MAX1619
Remote/Local Temperature Sensor with Dual-
Alarm Outputs and SMBus Serial Interface
________________________________________________________________ Maxim Integrated Products 1
MAX1619
SMBCLK
ADD0 ADD1
V
CC
STBY
GND
ALERT
SMBDATA
DXP
DXN INTERRUPT
TO
µ C
FAN
CONTROL
+3V TO +5.5V
200 Ω
0.1 µ F
CLOCK
10k EACH
DATA
2N3904 2200pF
OVERT
___________________Pin Configuration
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
V
CC
N.C.
STBY
SMBCLK
N.C.
SMBDATA
ALERT
ADD0
OVERT
TOP VIEW
MAX1619
QSOP
GND
DXP
ADD1
DXN
N.C.
GND
GND
Typical Operating Circuit
19-1483; Rev 0; 4/99
PART
MAX1619MEE -55°C to +125°C
TEMP. RANGE PIN-PACKAGE
16 QSOP
Ordering Information
SMBus is a registered trademark of Intel Corp.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.