Datasheet EMC1212 Datasheet (SMSC) [ru]

EMC1212

BBUS Compliant Dual
Temperature Monitor
with Beta Compensation

PRODUCT FEATURES

GENERAL DESCRIPTION

The EMC1212 is a temperature sensor that
communicates with a host over a single-wire SMSC
BudgetBus™ Sensor Interface. The EMC1212 monitors
one internal diode and one remote temperature zone.
Packaged in a SOT23-5, the EMC1212 provides an
accurate, low-cost, low-current, solution for critical
temperature monitoring in applications such as
embedded systems or computers. When used in
combination with an SMSC Super I/O host, such as a
keyboard controller, a complete thermal management
system is created. A power down mode extends battery
life in portable applications. The internal 11-bit sigma
delta temperature-to-digital converter provides superb
linearity, high accuracy and excellent noise immunity.

The EMC1212 is designed to operate with 65nm or
90nm PNP substrate transistor used as a thermal diode
with the collector connected to ground.

SIMPLIFIED BLOCK DIAGRAM

EMC1212

Datasheet

APPLICATIONS

 Desktop and Notebook Computers
 Hardware Management

FEATURES

 Single Wire BBUS Interface
 Resistance Error Correction
 Beta Compensation
 External Temperature Monitor

— 0.125°C resolution
— ±1°C Accuracy 60°C to 100°C
— Diode Fault Reporting

 Internal Temperature Monitor

— Range 0°C to +85°C
— 0.125°C resolution
— ±1.5°C Accuracy 50°C to 70°C

 Supply:

— 3.0V to 3.6V
— <5uA in Standby

Switching

Current

DP

DN

SMSC EMC1212 DATASHEET Revision 1.1 (02-07-07)

Beta

Comp

&

REC

Local Temp

Diode

Analog Mux

and

anti-aliasing

filter

11-bit

delta-sigma

ADC

Temperature

Registers

BBUS

Interface

BBUS

BBUS Compliant Dual Temperature Monitor with Beta Compensation

Datasheet

ORDER NUMBER(S):

EMC1212-AGZQ-TR FOR 5 PIN, SOT LEAD-FREE ROHS COMPLIANT PACKAGE

REEL SIZE IS 2,500 PIECES

EVALUATION BOARD AVAILABLE UPON REQUEST (EVB-KBC1100)

80 ARKAY DRIVE, HAUPPAUGE, NY 11788 [phone], FAX [phone]

Copyright © 2007 SMSC or its subsidiaries. All rights reserved.

Circuit diagrams and other information relating to SMSC products are included as a means of illustrating typical applications. Consequently, complete information sufficient for
construction purposes is not necessarily given. Although the information has been checked and is believed to be accurate, no responsibility is assumed for inaccuracies. SMSC
reserves the right to make changes to specifications and product descriptions at any time without notice. Contact your local SMSC sales office to obtain the latest specifications
before placing your product order. The provision of this information does not convey to the purchaser of the described semiconductor devices any licenses under any patent
rights or other intellectual property rights of SMSC or others. All sales are expressly conditional on your agreement to the terms and conditions of the most recently dated
version of SMSC's standard Terms of Sale Agreement dated before the date of your order (the "Terms of Sale Agreement"). The product may contain design defects or errors
known as anomalies which may cause the product's functions to deviate from published specifications. Anomaly sheets are available upon request. SMSC products are not
designed, intended, authorized or warranted for use in any life support or other application where product failure could cause or contribute to personal injury or severe property
damage. Any and all such uses withou t prior written approval of an Officer of SMSC and further testing and/or modification will be fully at the risk of the customer. Copies of
this document or other SMSC literature, as well as the Terms of Sale Agreement, may be obtained by visiting SMSC’s website at http://www.smsc.com. SMSC is a registered
trademark of Standard Microsystems Corporation (“SMSC”). Product names and company names are the trademarks of their respective holders.

SMSC DISCLAIMS AND EXCLUDES ANY AND ALL WARRANTIES, INCLUDING WITHOUT LIMITATION ANY AND ALL IMPLIED WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE, TITLE, AND AGAINST INFRINGEMENT AND THE LIKE, AND ANY AND ALL WARRANTIES ARISING FROM ANY COURSE
OF DEALING OR USAGE OF TRADE. IN NO EVENT SHALL SMSC BE LIABLE FOR ANY DIRECT, INCIDENTAL, INDIRECT, SPECIAL, PUNITIVE, OR CONSEQUENTIAL
DAMAGES; OR FOR LOST DATA, PROFITS, SAVINGS OR REVENUES OF ANY KIND; REGARDLESS OF THE FORM OF ACTION, WHETHER BASED ON CONTRACT;
TORT; NEGLIGENCE OF SMSC OR OTHERS; STRICT LIABILITY; BREACH OF WARRANTY; OR OTHERWISE; WHETHER OR NOT ANY REMEDY OF BUYER IS HELD
TO HAVE FAILED OF ITS ESSENTIAL PURPOSE, AND WHETHER OR NOT SMSC HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

Revision 1.1 (02-07-07) 2 SMSC EMC1212

DATASHEET

BBUS Compliant Dual Temperature Monitor with Beta Compensation

Datasheet

Chapter 1 Pin Description

VDD

GND

BBUS

1

5

DN

2

3

4

DP

Figure 1.1 Pin Diagram for EMC1212

Table 1.1 Pin Description

PIN NUMBER NAME FUNCTION

1 VDD Supply Voltage

2 GND Ground

3 BBUS Serial bus interface to SMSC host

4 DP Remote diode positive terminal

5 DN Remote diode negative terminal

SMSC EMC1212 3 Revision 1.1 (02-07-07)

DATASHEET

BBUS Compliant Dual Temperature Monitor with Beta Compensation

Chapter 2 Electrical Specifications

2.1 Absolute Maximum Ratings

Table 2.1 EMC1212 Maximum Ratings

DESCRIPTION RATING UNIT

Datasheet

Supply Voltage V

Voltage on any other pin to GND -0.3 to V

Operating Temperature Range 0 to 85 °C

Storage Temperature Range -55 to 150 °C

Lead Temperature Range Refer to JEDEC

Package Thermal Characteristics for SOT23-5

Power Dissipation TBD

Thermal Resistance(at 0 air flow) 131.7 °C/W

ESD Rating, All Pins Human Body Model 2000 V

DD

Note: Stresses above those listed could cause damage to the device. This is a stress rating only

and functional operation of the device at any other condition above those indicated in the
operation sections of this specification is not implied. When powering this device from
laboratory or system power supplies, it is important that the Absolute Maximum Ratings not be
exceeded or device failure can result. Some power supplies exhibit voltage spikes on their
outputs when the AC power is switched on or off. In addition, voltage transients on the AC
power line may appear on the DC output. If this possibility exists, it is suggested that a clamp
circuit be used.

-0.3 to 5.0 V

+0.3 V

DD

Spec. J-STD-020

2.2 Electrical Specifications

VDD = 3.3V ± 10% TA = 0°C to 85°C, all Typical values at TA = 27°C unless otherwise noted.

CHARACTERISTIC SYMBOL MIN TYP MAX UNIT CONDITIONS

DC Power

Supply Voltage V

Supply Current I

Supply Current I

Temperature Accuracy ±1 ±3 °C

Temperature Resolution 0.125 °C

Revision 1.1 (02-07-07) 4 SMSC EMC1212

DD

DD

DD

33.33.6V

700 1000 uA Active Mode

2 5 uA Standby Mode

Internal Temperature Monitor

±1.5 °C 50°C < T

DATASHEET

< 70°C

A

BBUS Compliant Dual Temperature Monitor with Beta Compensation

Datasheet

CHARACTERISTIC SYMBOL MIN TYP MAX UNIT CONDITIONS

External Temperature Monitor

Temperature Accuracy ±0.5 ±1 °C 60°C < T

< 70°C

±1 ±3 °C 0°C < T

< 100°C, 10°C < TA

DIODE

< 125°C

DIODE

Temperature Resolution 0.125 °C

Conversion Time per
Channel

Capacitive Load C

t

CONV

LOAD

21 mS

400 pF Connected across remote diode

2.3 BudgetBus Electrical Characteristics

VDD = 3V to 3.6V, TA = 0°C to 85°C, Typical values are at TA = 27°C unless otherwise noted.

CHARACTERISTIC SYMBOL MIN TYP MAX UNITS CONDITIONS

Output High Voltage V

Output Low Voltage V

Input High Voltage V

Input Low Voltage V

OH

OL

IH

IL

2.4 V 2mA Sourcing current

0.4 V 4mA Sinking Current

2.4 V

0.4 V

AC Parameters

Input Capacitance C

Bus Single Bit High Time
or Low Time

Inactive Time T

Power Down Time T

Rise Time T

Fall Time T

IN

T

HIGH /

T

LOW

INACTIVE

PWRDN

RISE

FAL L

81012us

132 us Between Consecutive packets or

264 us To initiate power down

2.4 BudgetBus Protocol

The EMC1212 communicates with a host controller, such as the SMSC KBC1100, through the
proprietary single wire SMSC BudgetBus™ Sensor Interface known as BBUS. The BBUS is a single
wire serial communication protocol between the computer host and its peripheral devices. Please refer
to the BBUS Specification for detailed information about the modes of operation.

The BudgetBus timing is shown in Figure 2.1. This timing applies to all BudgetBus communication bits.

10 pF

after power up

400 ns

400 ns

SMSC EMC1212 5 Revision 1.1 (02-07-07)

DATASHEET

BBUS Compliant Dual Temperature Monitor with Beta Compensation

Datasheet

t

t

RISE

FALL

t

PWRDN

'0'

t

INACTIVE

t

LOW

Figure 2.1 BudgetBus Bit Timing

'1'

t

HIGH

Revision 1.1 (02-07-07) 6 SMSC EMC1212

DATASHEET

BBUS Compliant Dual Temperature Monitor with Beta Compensation

Datasheet

Chapter 3 Product Description

The EMC1212 is a SOT23 temperature sensor with a proprietary single wire SMSC BudgetBus™
Sensor Interface. Temperature information is communicated to a host device via the serial bus. All
intelligence regarding the interpretation of temperature resides in the host. The EMC1212 monitors an
internal diode and single external transistor and automatically corrects for errors induced by series
resistance and beta variation. Figure 3.1 shows a typical system overview:

EMC1212 Host

DP

(e.g. KBC1122)

DN

Figure 3.1 System Diagram of EMC1212

Thermal management consists of the host acquiring the temperature data from the EMC1212 and
controlling the speed of one or more fans. Because the EMC1212 incorporates one internal and one
external temperature diode, up to two separate thermal zones can be monitored and controlled. The
host has the ability to compare measured temperature levels to preset limits and take the appropriate
action when values are found to be out of limit.

3.1 Power Modes

The EMC1212 has two basic modes of operation that are controlled entirely by the host device.

Standby Mode:

The host can initiate standby mode by actively pulling the BBUS low. When the Host places the device
in standby mode, the device immediately powers down to draw < 2uA of supply current. It will remain
in this state until it is awakened by the host. If the host pulls the BBUS line low while temperature data
is being clocked out, the device will not enter standby mode until completion of the data transfer. After
entering standby mode, the device will remain in this mode until it is forced into active mode by the
host. The transition from standby to active mode occurs when the host is no longer pulling the BBUS
low.

BBUS

BBUS

Interface

Active Mode:

The host initiates active mode by enabling a weak pull up on the BBUS. In this mode, the EMC1212
continuously converts temperature data. During the time that the device is actively converting a
temperature, the BBUS is in tri-state mode, and the Host places a weak pull-up on the bus to prevent
it from floating. After a conversion is completed, the device automatically clocks out the data from the
most recent conversion to the host. When the data packet has been entirely clocked out, the BBUS
returns to tri-state mode, and the ADC begins converting the next temperature sample. While BBUS
is in tri-state mode, the host can command the device to standby mode.

SMSC EMC1212 7 Revision 1.1 (02-07-07)

DATASHEET

3.2 Temperature Monitor

Thermal diode temperature measurements are based on the change in forward bias voltage of a diode
when operated at two or more different currents.

VVV ln

__

BBUS Compliant Dual Temperature Monitor with Beta Compensation

Datasheet

where:

kT

q

⎛
⎜

⎜
⎝

η

=−=Δ

LOWBEHIGHBEBE

I

I

HIGH

LOW

⎞
⎟

⎟
⎠

k = Boltzmann’s constant

T = absolute temperature in Kelvin

q = electron charge

η

= diode ideality factor

As can be seen in this equation, the delta V
shows a block diagram of the temperature monitoring circuitry. The delta V
effective rate of 3.125kHz and then measured by the internal 11 bit delta sigma ADC.

The advantages of this architecture over Nyquist rate FLASH or SAR converters are superb linearity
and inherent noise immunity. The linearity can be directly attributed to the delta sigma ADC single bit
comparator while the noise immunity is achieved by the 20.75ms integration time. The input bandwidth
of the system is fs/2048, this translates to 50Hz at a 100kHz clock frequency.

Beta

CPU

substrate

PNP

Compensation

Circuitry

voltage is directly proportional to temperature. Figure 3.2

BE

Resistance

Error

Correction

I

HIGH

I

LOW

Input

Filter &

Sampler

is first sampled at an

BE

11-bit

delta-sigma

ADC

Figure 3.2 Block Diagram of Temperature Monitoring

The temperature data format is an offset 2’s complement with a range of -64°C to +191.875°C as
shown in Ta b le 3 .1 .

Table 3.1 EMC1212 Temperature Data Format

2’S COMPLEMENT FORMAT

TEMPERATURE (°C)

Diode Fault or -64 100 0000 0000 400h

-63.875 100 0000 0001 401h

-63 100 0000 1000 408h

-1 110 1111 1000 6F8h

0 110 0000 0000 600h

Revision 1.1 (02-07-07) 8 SMSC EMC1212

BINARY HEX

DATASHEET

BBUS Compliant Dual Temperature Monitor with Beta Compensation

Datasheet

Table 3.1 EMC1212 Temperature Data Format (continued)

2’S COMPLEMENT FORMAT

TEMPERATURE (°C)

1 110 0000 1000 608h

63 111 1111 1000 7F8h

64 000 0000 0000 000h

65 000 0000 1000 008h

128 010 0000 0000 200h

191 011 1111 1000 3F8h

191.875 011 1111 1111 3FFh

The external diode supported by the EMC1212 must be connected as shown in Figure 3.3. The
EMC1202 availabe from SMSC will support other diode configurations.

BINARY HEX

to

DP

to

DN

Local Ground

Typical remote

substrate transistor

i.e. CPU substrate PNP

Figure 3.3 External Diode Configuration

3.3 Resistance Error Correction

The EMC1212 includes resistance error correction implemented in the analog front end of the chip.
Resistance error correction is an automatic feature that eliminates the need to characterize and
compensate for the series resistance in the external diode lines.

When using a temperature sensor that does not include resistance error correction, voltage developed
across the parasitic resistance in the remote diode path produces an error in the reported temperature.
The error introduced by this resistance is approximately 0.7°C per ohm. Sources of series resistance
are PCB trace resistance, on die (i.e. on the processor) metal resistance, bulk resistance in the base
and emitter of the temperature transistor.

SMSC EMC1212 9 Revision 1.1 (02-07-07)

DATASHEET

3.4 Beta Compensation

The beta compensation circuitry corrects for beta variation in PNP substrate transistors used as
thermal diodes. The EMC1212 is designed to work with 65nm processors manufactured by Intel.

For discrete transistors connected with collector to base as a diode, the beta is generally sufficiently
high to make this relative beta variation very small (a variation of 10% from low current to high current
when beta = 50 contributes approximately 0.25°C error at 100°C). However, for substrate transistors
where the VBE junction is used for temperature measurement and the collector is tied to the substrate,
the proportional beta variation causes more error (a variation of 10% from low current to high current
when beta = 0.5 contributes approximately 8.25°C at 100°C).

Because the beta compensation circuit is designed to work with PNP substrate transistors, the
EMC1212 should not be used with diode-connected transistors (such as the 2N3904) or CPUs that
implement the thermal diode as a two-terminal diode. The beta compensation circuit is not present in
the EMC1202 availabe from SMSC, and this device is an excellent companion to AMD CPUs.

3.5 Conversion Rate

The conversion rate is fixed to the value given in Section 2.2, but conversions may be halted by
periodically placing the device in standby as described in Section 3.1, "Power Modes".

BBUS Compliant Dual Temperature Monitor with Beta Compensation

Datasheet

Revision 1.1 (02-07-07) 10 SMSC EMC1212

DATASHEET

BBUS Compliant Dual Temperature Monitor with Beta Compensation

Datasheet

Chapter 4 Typical Operating Curves

To be determined based on characterization.

SMSC EMC1212 11 Revision 1.1 (02-07-07)

DATASHEET

Revision 1.1 (02-07-07) 12 SMSC EMC1212

Chapter 5 Package Drawing

3

D

6

N4

SE E D ETAIL "A"

REVISION HISTORY

A INITIAL RELEASE 7/07/04 S.K.ILIEV

DESCRIPTIONREVISION RELEASED BYDATE

BBUS Compliant Dual Temperature Monitor with Beta Compensation

Datasheet

DATASHEET

3

IND EX A REA

(D/2 x E1/2)

5

C

E1

123

e 5X b

E

24

TOP VIEW

A2

SEATING PLANE

ccc C

A1

SIDE VIEW

N = 5 LEADS N = 6 LEADS

3-D VIEWS

c

4

END VIEW

H

L

L1

GAUGE PLANE

0

UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN MILLIME TERS
AND TOLERANCES ARE:

DECIMAL

±0.1

X.X

±0.05

X.XX

±0.025

X.XXX

DIM AND TOL P ER ASM E Y14. 5M - 1994

MATERIAL

FINISH

PRINT WITH "SCALE T O FIT"
DO NOT SCALE DRAWING

0.25

-

-

NOTES:

1. "N" IS THE TOTAL NUMBER OF LEADS .

2. TRUE POSITION SPREAD TOLERAN CE IS ± 0.10mm AT MAXIMUM MATERIAL CONDITION.

3. PACKAGE BODY DIMENSION "D" DOE S NOT INCLUDE MOLD FLASH, PROTRUSIONS OR
GATE BU RRS. MAXIMUM M OLD FLASH, PROTRUSIONS OR GATE BURRS IS 0.25 mm PER
END. DIMENSION "E1" DOES N OT INCLUDE INTERLEAD FLASH OR PROTRUSION.
MA XIMU M INT ERLE AD F LASH OR P ROT RUS ION IS 0.25 mm PER SIDE. "D1" & "E1"
DIM ENS ION S ARE DET ERMINE D AT DATUM PLANE "H".

4. DIMENSIONS "b" & "c" APPLY TO THE FLAT SECTION OF THE LEAD BETWEEN 0.08 TO

0.15 mm F ROM THE LEAD TIP.

5. D ETAIL S OF PIN 1 ID ENT IFIER ARE O PTIO NAL , BUT MUST BE LOC ATED WITH IN THE
IND EX AREA INDICAT ED (SEE TOP VIEW).

6. FIVE LEAD PACKAGE IS A VERSION OF 6 LEAD PACKAGE, WHERE LEAD #5 HAS BEEN
RE MO VED FR OM 6 LEAD PACKAG E.

ANGULAR

±1°

THIRD ANGLE PROJECTION

NAME

DRAWN

S.K .ILIEV

CHECKED

S.K .ILIEV

APPROVED

S.K .ILIEV

7/06/04

7/06/04 A

7/07/04 1:1

80 ARKAY DRIVE
HAUPPAUGE, NY 11788
USA

TITLE

DATE

DWG NUMBER

SCALE

PACKAGE OUTLINE: 5/6 PIN SOT

1.6mm BODY WIDTH, 0.95mm PITCH

MO-5/6 SO T-2.9x1.6

STD CO MPLIANCE

JEDEC: MO-178 / AA, AB

SHEET

REV

1 OF 1

A

DETAIL "A" (SCALE: 2/1)

Figure 5.1 EMC1212 Package Outline and Parameters

BBUS Compliant Dual Temperature Monitor with Beta Compensation

Datasheet

5.1 Package Markings

All devices will be marked on the top side with “212” and a lead free symbol. On the bottom, they will
be marked with YYWW (2 digits for work week, 2 digits for year)

SMSC EMC1212 13 Revision 1.1 (02-07-07)

DATASHEET