MAX1617AMEE-T Maxim Integrated Products, MAX1617AMEE-T Datasheet

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MAX1617AMEE-T

Manufacturer Part Number
MAX1617AMEE-T
Description
Board Mount Temperature Sensors
Manufacturer
Maxim Integrated Products
Datasheet

Specifications of MAX1617AMEE-T

Full Temp Accuracy
+/- 3 C
Package / Case
QSOP-16
Digital Output - Bus Interface
Serial (2-Wire)
Digital Output - Number Of Bits
7 bit + Sign
Maximum Operating Temperature
+ 125 C
Minimum Operating Temperature
- 55 C
Output Type
Digital
Lead Free Status / Rohs Status
Lead free / RoHS Compliant

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________________General Description
The MAX1617A 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
transistor—typically a low-cost, easily mounted 2N3904
NPN type—that replaces conventional thermistors or ther-
mocouples. Remote accuracy is ±3°C for multiple transis-
tor 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
___________________Pin Configuration
19-4508; Rev 0; 1/99
SMBus is a 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.
Desktop and Notebook
Computers
Smart Battery Packs
LAN Servers
Industrial Controls
TOP VIEW
ADD1
DXN
GND
GND
N.C.
DXP
N.C.
V
CC
________________________________________________________________ Maxim Integrated Products
1
2
6
3
4
5
7
8
MAX1617A
QSOP
Central Office
Telecom Equipment
Test and Measurement
Multichip Modules
Remote/Local Temperature Sensor
16
15
14
13
12
11
10
9
N.C.
STBY
SMBCLK
N.C.
SMBDATA
ALERT
ADD0
N.C.
with SMBus Serial Interface
♦ Two Channels: Measures Both Remote and Local
♦ No Calibration Required
♦ SMBus 2-Wire Serial Interface
♦ Programmable Under/Overtemperature Alarms
♦ Supports SMBus Alert Response
♦ Supports Manufacturer and Device ID Codes
♦ Accuracy
♦ 3µA (typ) Standby Supply Current
♦ 70µA (max) Supply Current in Auto-Convert Mode
♦ +3V to +5.5V Supply Range
♦ Small 16-Pin QSOP Package
____________________________Features
MAX1617AMEE
Temperatures
±2°C (+60°C to +100°C, local)
±3°C (-40°C to +125°C, local)
±3°C (+60°C to +100°C, remote)
2N3904
PART
Typical Operating Circuit
2200pF
0.1µF
-55°C to +125°C
TEMP. RANGE
DXP
DXN
ADD0 ADD1
Ordering Information
MAX1617A
V
CC
SMBDATA
SMBCLK
STBY
ALERT
GND
200Ω
3V TO 5.5V
16 QSOP
PIN-PACKAGE
10k EACH
INTERRUPT
TO µC
CLOCK
DATA
1

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MAX1617AMEE-T Summary of contents

Page 1

... Standby Supply Current ♦ 70µA (max) Supply Current in Auto-Convert Mode ♦ +3V to +5.5V Supply Range ♦ Small 16-Pin QSOP Package PART MAX1617AMEE 16 N.C. 15 STBY 14 SMBCLK 13 N ...

Page 2

Remote/Local Temperature Sensor with SMBus Serial Interface ABSOLUTE MAXIMUM RATINGS V to GND ..............................................................-0.3V to +6V CC DXP, ADD_ to GND ....................................-0. DXN to GND ..........................................................-0.3V to +0.8V ALERT, STBY to GND ...........-0.3V to +6V SMBCLK, SMBDATA, SMBDATA, ...

Page 3

Remote/Local Temperature Sensor ELECTRICAL CHARACTERISTICS (continued +3.3V 0°C to +85°C, unless otherwise noted PARAMETER SMBus INTERFACE Logic Input High Voltage Logic Input Low Voltage Logic Output Low Sink Current ALERT Output High Leakage Current ...

Page 4

Remote/Local Temperature Sensor with SMBus Serial Interface ELECTRICAL CHARACTERISTICS (continued +3.3V -55°C to +125°C, unless otherwise noted.) (Note PARAMETER SMBus INTERFACE STBY, SMBCLK, SMBDATA Logic Input High Voltage STBY, SMBCLK, SMBDATA; V Logic ...

Page 5

Remote/Local Temperature Sensor ____________________________Typical Operating Characteristics (continued +25°C, unless otherwise noted.) A TEMPERATURE ERROR vs. COMMON-MODE NOISE FREQUENCY SQUARE WAVE IN AC COUPLED TO DXN V = 100mVp 50mVp ...

Page 6

Remote/Local Temperature Sensor with SMBus Serial Interface PIN NAME N.C. No Connection. Not internally connected. May be used for PC board trace routing. 13, 16 Supply Voltage Input 5.5V. Bypass to GND with a 0.1µF ...

Page 7

Remote/Local Temperature Sensor Figure 1. Functional Diagram _______________________________________________________________________________________ with SMBus Serial Interface 7 ...

Page 8

Remote/Local Temperature Sensor with SMBus Serial Interface Excess resistance in series with the remote diode caus- es about +1/2°C error per ohm. Likewise, 200µV of off- set voltage forced on DXP–DXN causes about 1°C error. A/D Conversion Sequence If a ...

Page 9

Remote/Local Temperature Sensor 1) Place the MAX1617A as close as practical to the remote diode noisy environment, such as a computer motherboard, this distance can in. (typical) or more as long as the ...

Page 10

Remote/Local Temperature Sensor with SMBus Serial Interface the MAX1617A can be forced to perform A/D conver- sions via the one-shot command, despite the RUN/STOP bit being high. Activate hardware standby mode by forcing the STBY pin low notebook ...

Page 11

Remote/Local Temperature Sensor Table 2. Data Format (Two’s Complement) DIGITAL OUTPUT ROUNDED TEMP. TEMP. (°C) (°C) SIGN +130.00 +127 0 +127.00 +127 0 +126.50 +127 0 +126.00 +126 0 +25.25 +25 0 +0. +0. 0.00 0 ...

Page 12

Remote/Local Temperature Sensor with SMBus Serial Interface Table 4. Command-Byte Bit Assignments REGISTER COMMAND RLTS 00h RRTE 01h RSL 02h RCL 03h RCRA 04h RLHN 05h RLLI 06h RRHI 07h RRLS 08h WCA 09h WCRW 0Ah WLHO 0Bh WLLM 0Ch ...

Page 13

Remote/Local Temperature Sensor Table 5. Configuration-Byte Bit Assignments POR BIT NAME STATE Masks all ALERT inter- 7 (MSB) MASK 0 rupts when high. Standby mode control bit. If high, the device immediately stops con- RUN verting and enters ...

Page 14

Remote/Local Temperature Sensor with SMBus Serial Interface Table 8. RLTS and RRTE Temp Register Update Timing Chart OPERATING MODE CONVERSION INITIATED BY: Auto-Convert Power-on reset 1-shot command, while idling Auto-Convert between automatic conversions 1-shot command that occurs Auto-Convert during a ...

Page 15

Remote/Local Temperature Sensor LOW HIGH SMBCLK SMBDATA t t HD:STA SU:STA A = START CONDITION B = MSB OF ADDRESS CLOCKED INTO SLAVE C = LSB OF ADDRESS CLOCKED INTO SLAVE D = R/W BIT CLOCKED ...

Page 16

Remote/Local Temperature Sensor with SMBus Serial Interface Listing 1. Pseudocode Example 16 ______________________________________________________________________________________ ...

Page 17

Remote/Local Temperature Sensor Listing 1. Pseudocode Example (continued) Programming Example: Clock-Throttling Control for CPUs Listing 1 gives an untested example of pseudocode for proportional temperature control of Intel mobile CPUs via a power-management microcontroller. This program consists of two main ...

Page 18

Remote/Local Temperature Sensor with SMBus Serial Interface Listing 1. Pseudocode Example (continued) 18 ______________________________________________________________________________________ ...

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