Rainbow Electronics MAX1617A - Manual

________________General Description
The MAX1617A (patents pending) is a precise digital ther-
mometer that reports the temperature of both a remote
sensor and its own package. The remote sensor is a
diode-connected transistor—typically a low-cost, easily
mounted 2N3904 NPN type—that replaces conventional
thermistors or thermocouples. 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 MAX1617A is nearly identical to the popular MAX1617,
but has improved SMBus timing specifications, improved
bus collision immunity, software manufacturer and device
identification available via the serial interface, and a power-
on reset function that can force a reset of the slave address
via the serial interface.
________________________Applications
Desktop and Notebook Central Office
Computers Telecom Equipment
Smart Battery Packs Test and Measurement
LAN Servers Multichip Modules
Industrial Controls
____________________________Features
♦ Two Channels: Measures Both Remote and Local
Temperatures
♦ No Calibration Required
♦ SMBus 2-Wire Serial Interface
♦ Programmable Under/Overtemperature Alarms
♦ 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
♦ Small 16-Pin QSOP Package
MAX1617
A
†
Remote/Local Temperature Sensor
with SMBus Serial Interface
________________________________________________________________ Maxim Integrated Products 1
MAX1617A
SMBCLK
ADD0 ADD1
V CC
STBY
GND
ALERT
SMBDATA
DXP
DXN INTERRUPT
TO
µ C
3V TO 5.5V
200 Ω
0.1 µ F
CLOCK
10k EACH
DATA
2N3904 2200pF
___________________Pin Configuration
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
N.C. N.C.
STBY
SMBCLK
N.C.
SMBDATA
ALERT
ADD0
N.C.
TOP VIEW
MAX1617A
QSOP
V CC
DXP
ADD1
DXN
N.C.
GND
GND
Typical Operating Circuit
19-4508; Rev 0; 1/99
PART*
MAX1617AMEE -55°C to +125°C
TEMP. RANGE PIN-PACKAGE
16 QSOP
EVALUATION KIT MANUAL
FOLLOWS DATA SHEET
Ordering Information
SMBus is a registered trademark of Intel Corp.
* U.S. and foreign patents pending.
† Patents Pending
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.