Datasheet

ManualsBrandsMAXIM INTEGRATED ManualsPMICsMAX1617AMEE+

Remote/Local Temperature Sensor

with SMBus Serial Interface

For pricing, delivery, and ordering information, please contact Maxim Direct

at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com

MAX1617A

EVALUATION KIT AVAILABLE

________________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

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

MAX1617A

SMBCLK

ADD0 ADD1

STBY

GND

ALERT

SMBDATA

DXP

DXN

INTERRUPT

TO µC

3V TO 5.5V

200Ω

0.1µF

CLOCK

10k EACH

DATA

2N3904

2200pF

___________________Pin Configuration

N.C. N.C.

STBY

SMBCLK

N.C.

SMBDATA

ALERT

ADD0

N.C.

TOP VIEW

MAX1617A

QSOP

DXP

ADD1

DXN

N.C.

GND

Typical Operating Circuit

PART

MAX1617AMEE+ -55°C to +125°C

TEMP. RANGE PIN-PACKAGE

16 QSOP

Ordering Information

19-4508; Rev 1; 10/12

+Denotes a lead(Pb)-free/RoHS-compliant package.

Summary of content (20 pages)

PAGE 1
EVALUATION KIT AVAILABLE MAX1617A Remote/Local Temperature Sensor with SMBus Serial Interface ________________General Description ____________________________Features 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 thermocouples.
PAGE 2
MAX1617A Remote/Local Temperature Sensor with SMBus Serial Interface ABSOLUTE MAXIMUM RATINGS VCC to GND ..............................................................-0.3V to +6V DXP, ADD_ to GND ....................................-0.3V to (VCC + 0.3V) DXN to GND ..........................................................-0.3V to +0.8V SMBCLK, SMBDATA, ALERT, STBY to GND ...........-0.3V to +6V SMBDATA, ALERT Current .................................-1mA to +50mA DXN Current ...............................
PAGE 3
MAX1617A Remote/Local Temperature Sensor with SMBus Serial Interface ELECTRICAL CHARACTERISTICS (continued) (VCC = +3.3V, TA = 0°C to +85°C, unless otherwise noted.) (Note 1) PARAMETER CONDITIONS MIN TYP MAX UNITS SMBus INTERFACE Logic Input High Voltage STBY, SMBCLK, SMBDATA; VCC = 3V to 5.5V Logic Input Low Voltage STBY, SMBCLK, SMBDATA; VCC = 3V to 5.5V Logic Output Low Sink Current ALERT, SMBDATA forced to 0.4V ALERT Output High Leakage Current ALERT forced to 5.
PAGE 4
MAX1617A Remote/Local Temperature Sensor with SMBus Serial Interface ELECTRICAL CHARACTERISTICS (continued) (VCC = +3.3V, TA = -55°C to +125°C, unless otherwise noted.) (Note 1) PARAMETER CONDITIONS MIN TYP MAX UNITS SMBus INTERFACE VCC = 3V 2.2 VCC = 5.5V 2.4 Logic Input High Voltage STBY, SMBCLK, SMBDATA Logic Input Low Voltage STBY, SMBCLK, SMBDATA; VCC = 3V to 5.5V Logic Output Low Sink Current ALERT, SMBDATA forced to 0.4V ALERT Output High Leakage Current ALERT forced to 5.
PAGE 5
MAX1617A Remote/Local Temperature Sensor with SMBus Serial Interface ____________________________Typical Operating Characteristics (continued) (TA = +25°C, unless otherwise noted.) VIN = 50mVp-p VIN = 25mVp-p 0 10 VIN = 10mVp-p SQUARE WAVE APPLIED TO DXP-DXN TEMPERATURE ERROR (°C) 20 MAX1617ATOC03 VIN = 100mVp-p TEMPERATURE ERROR (°C) VIN = SQUARE WAVE AC COUPLED TO DXN TEMPERATURE ERROR (°C) 5 MAX1617ATOC05 30 10 TEMPERATURE ERROR vs. DIFFERENTIAL-MODE NOISE FREQUENCY TEMPERATURE ERROR vs.
PAGE 6
MAX1617A Remote/Local Temperature Sensor with SMBus Serial Interface Pin Description PIN NAME FUNCTION 1, 5, 9, 13, 16 N.C. No Connection. Not internally connected. May be used for PC board trace routing. 2 VCC Supply Voltage Input, 3V to 5.5V. Bypass to GND with a 0.1µF capacitor. A 200Ω series resistor is recommended but not required for additional noise filtering. 3 DXP Combined Current Source and A/D Positive Input for Remote-Diode Channel.
PAGE 7
Maxim Integrated ALERT GND DXN DXP VCC REMOTE TEMPERATURE DATA REGISTER DIODE FAULT LOCAL REMOTE - + Q R S DIGITAL COMPARATOR (REMOTE) 8 LOW-TEMPERATURE THRESHOLD (REMOTE TLOW) 8 HIGH-TEMPERATURE THRESHOLD (REMOTE THIGH) 8 + - + MUX ADC 8 CONTROL LOGIC SELECTED VIA SLAVE ADD = 0001 100 DIGITAL COMPARATOR (LOCAL) 8 LOW-TEMPERATURE THRESHOLD (LOCAL TLOW) HIGH-TEMPERATURE THRESHOLD 8 (LOCAL THIGH) LOCAL TEMPERATURE DATA REGISTER MAX1617A 2 8 READ ALERT RESPONSE ADDRESS REGISTE
PAGE 8
MAX1617A Remote/Local Temperature Sensor with SMBus Serial Interface Excess resistance in series with the remote diode causes about +1/2°C error per ohm. Likewise, 200µV of offset voltage forced on DXP–DXN causes about 1°C error. A/D Conversion Sequence If a Start command is written (or generated automatically in the free-running auto-convert mode), both channels are converted, and the results of both measurements are available after the end of conversion.
PAGE 9
MAX1617A Remote/Local Temperature Sensor with SMBus Serial Interface PC Board Layout 1) Place the MAX1617A as close as practical to the remote diode. In a noisy environment, such as a computer motherboard, this distance can be 4 in. to 8 in. (typical) or more as long as the worst noise sources (such as CRTs, clock generators, memory buses, and ISA/PCI buses) are avoided. 2) Do not route the DXP–DXN lines next to the deflection coils of a CRT.
PAGE 10
MAX1617A MAX1617A Remote/Local Temperature Sensor with SMBus Serial Interface the MAX1617A can be forced to perform A/D conversions via the one-shot command, despite the RUN/STOP bit being high. Activate hardware standby mode by forcing the STBY pin low. In a notebook computer, this line may be connected to the system SUSTAT# suspend-state signal.
PAGE 11
MAX1617A Remote/Local Temperature Sensor with SMBus Serial Interface Table 2. Data Format (Two’s Complement) DIGITAL OUTPUT DATA BITS ROUNDED TEMP. (°C) SIGN MSB LSB +130.00 +127 0 111 +127.00 +127 0 +126.50 +127 0 +126.00 +126 +25.25 +25 TEMP. (°C) Table 3. Read Format for Alert Response Address (0001100) BIT NAME 1111 7 (MSB) ADD7 111 1111 6 ADD6 111 1111 5 ADD5 0 111 1110 4 ADD4 0 001 1001 3 ADD3 ADD2 +0.50 +1 0 000 0001 2 +0.
PAGE 12
MAX1617A Remote/Local Temperature Sensor with SMBus Serial Interface Table 4.
PAGE 13
MAX1617A Remote/Local Temperature Sensor with SMBus Serial Interface Table 5. Configuration-Byte Bit Assignments Table 7. Conversion-Rate Control Byte DATA CONVERSION RATE (Hz) AVERAGE SUPPLY CURRENT (µA typ, at VCC = 3.3V) BIT NAME POR STATE 7 (MSB) MASK 0 Masks all ALERT interrupts when high. 00h 0.0625 30 01h 0.125 33 02h 0.25 35 03h 0.5 48 0 Standby mode control bit. If high, the device immediately stops converting and enters standby mode.
PAGE 14
MAX1617A Remote/Local Temperature Sensor with SMBus Serial Interface Table 8. RLTS and RRTE Temp Register Update Timing Chart OPERATING MODE CONVERSION INITIATED BY: NEW CONVERSION RATE (CHANGED VIA WRITE TO WCRW) n/a (0.
PAGE 15
MAX1617A Remote/Local Temperature Sensor with SMBus Serial Interface A tLOW B tHIGH C E D F G I H J K L M SMBCLK SMBDATA tHD:STA tSU:STA tSU:DAT A = START CONDITION B = MSB OF ADDRESS CLOCKED INTO SLAVE C = LSB OF ADDRESS CLOCKED INTO SLAVE D = R/W BIT CLOCKED INTO SLAVE E = SLAVE PULLS SMBDATA LINE LOW tHD:DAT tSU:STO tBUF J = ACKNOWLEDGE CLOCKED INTO MASTER K = ACKNOWLEDGE CLOCK PULSE L = STOP CONDITION, DATA EXECUTED BY SLAVE M = NEW START CONDITION F = ACKNOWLEDGE BIT CLOCKED IN
PAGE 16
MAX1617A Remote/Local Temperature Sensor with SMBus Serial Interface Listing 1.
PAGE 17
MAX1617A Remote/Local Temperature Sensor with SMBus Serial Interface 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 parts: an initialization routine and an interrupt handler.
PAGE 18
MAX1617A Remote/Local Temperature Sensor with SMBus Serial Interface Listing 1.
PAGE 19
MAX1617A Remote/Local Temperature Sensor with SMBus Serial Interface Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE 16 QSOP Maxim Integrated PACKAGE CODE OUTLINE NO. LAND PATTERN NO.
PAGE 20
MAX1617A Remote/Local Temperature Sensor with SMBus Serial Interface Revision History REVISION NUMBER REVISION DATE 0 1/99 Initial release 10/12 Updated Electrical Characteristics tables (added new Note 1); updated ADC and Multiplexer and Remote-Diode Selection sections 1 DESCRIPTION PAGES CHANGED — 2–4, 6, 8 Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied.