SMSC EMC1212 Bbus compliant dual temperature monitor with beta compensation Datasheet

EMC1212
BBUS Compliant Dual
Temperature Monitor
with Beta Compensation
PRODUCT FEATURES
Datasheet
GENERAL DESCRIPTION
APPLICATIONS
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.
„
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
SIMPLIFIED BLOCK DIAGRAM
EMC1212
Switching
Current
DP
DN
Beta
Comp
&
REC
Local Temp
Diode
Analog Mux
and
anti-aliasing
filter
11-bit
delta-sigma
ADC
Temperature
Registers
BBUS
Interface
SMSC EMC1212
DATASHEET
BBUS
Revision 1.1 (02-07-07)
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 (631) 435-6000, FAX (631) 273-3123
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 without 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)
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DATASHEET
SMSC EMC1212
BBUS Compliant Dual Temperature Monitor with Beta Compensation
Datasheet
Chapter 1 Pin Description
VDD
1
GND
2
BBUS
3
5
DN
4
DP
Figure 1.1 Pin Diagram for EMC1212
Table 1.1 Pin Description
PIN NUMBER
SMSC EMC1212
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
3
DATASHEET
Revision 1.1 (02-07-07)
BBUS Compliant Dual Temperature Monitor with Beta Compensation
Datasheet
Chapter 2 Electrical Specifications
2.1
Absolute Maximum Ratings
Table 2.1 EMC1212 Maximum Ratings
DESCRIPTION
Supply Voltage VDD
Voltage on any other pin to GND
Operating Temperature Range
Storage Temperature Range
Lead Temperature Range
RATING
UNIT
-0.3 to 5.0
V
-0.3 to VDD +0.3
V
0 to 85
°C
-55 to 150
°C
Refer to JEDEC
Spec. J-STD-020
Package Thermal Characteristics for SOT23-5
Power Dissipation
TBD
Thermal Resistance(at 0 air flow)
131.7
°C/W
2000
V
ESD Rating, All Pins Human Body Model
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.
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
VDD
Supply Current
Supply Current
3
3.3
3.6
V
IDD
700
1000
uA
Active Mode
IDD
2
5
uA
Standby Mode
Internal Temperature Monitor
Temperature Accuracy
Temperature Resolution
Revision 1.1 (02-07-07)
±1
±3
°C
±1.5
°C
0.125
50°C < TA < 70°C
°C
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DATASHEET
SMSC EMC1212
BBUS Compliant Dual Temperature Monitor with Beta Compensation
Datasheet
CHARACTERISTIC
SYMBOL
MIN
TYP
MAX
UNIT
CONDITIONS
External Temperature Monitor
Temperature Accuracy
Temperature Resolution
Conversion Time per
Channel
tCONV
Capacitive Load
CLOAD
2.3
±0.5
±1
°C
60°C < TDIODE < 100°C, 10°C < TA
< 70°C
±1
±3
°C
0°C < TDIODE < 125°C
0.125
°C
21
mS
400
pF
Connected across remote diode
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
Output High Voltage
VOH
Output Low Voltage
VOL
Input High Voltage
VIH
Input Low Voltage
VIL
MIN
TYP
MAX
2.4
0.4
2.4
UNITS
CONDITIONS
V
2mA Sourcing current
V
4mA Sinking Current
V
0.4
V
AC Parameters
Input Capacitance
CIN
Bus Single Bit High Time
or Low Time
THIGH /
TLOW
8
Inactive Time
TINACTIVE
132
us
Between Consecutive packets or
after power up
Power Down Time
TPWRDN
264
us
To initiate power down
Rise Time
TRISE
400
ns
Fall Time
TFALL
400
ns
2.4
10
10
pF
12
us
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.
SMSC EMC1212
5
DATASHEET
Revision 1.1 (02-07-07)
BBUS Compliant Dual Temperature Monitor with Beta Compensation
Datasheet
tFALL
tRISE
'0'
tINACTIVE
tLOW
tPWRDN
'1'
tHIGH
Figure 2.1 BudgetBus Bit Timing
Revision 1.1 (02-07-07)
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DATASHEET
SMSC EMC1212
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
(e.g. KBC1122)
DP
DN
BBUS
Interface
BBUS
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.
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
DATASHEET
Revision 1.1 (02-07-07)
BBUS Compliant Dual Temperature Monitor with Beta Compensation
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.
where:
ΔVBE = VBE _ HIGH − VBE _ LOW
⎛I
ln⎜⎜ HIGH
=
q
⎝ I LOW
ηkT
⎞
⎟⎟
⎠
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 VBE voltage is directly proportional to temperature. Figure 3.2
shows a block diagram of the temperature monitoring circuitry. The delta VBE is first sampled at an
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.
IHIGH
Beta
Compensation
Circuitry
CPU
substrate
PNP
Resistance
Error
Correction
ILOW
Input
Filter &
Sampler
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 Table 3.1.
Table 3.1 EMC1212 Temperature Data Format
2’S COMPLEMENT FORMAT
TEMPERATURE (°C)
BINARY
HEX
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)
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DATASHEET
SMSC EMC1212
BBUS Compliant Dual Temperature Monitor with Beta Compensation
Datasheet
Table 3.1 EMC1212 Temperature Data Format (continued)
2’S COMPLEMENT FORMAT
TEMPERATURE (°C)
BINARY
HEX
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
011 1111 1111
3FFh
191.875
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.
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
DATASHEET
Revision 1.1 (02-07-07)
BBUS Compliant Dual Temperature Monitor with Beta Compensation
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".
Revision 1.1 (02-07-07)
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DATASHEET
SMSC EMC1212
BBUS Compliant Dual Temperature Monitor with Beta Compensation
Datasheet
Chapter 4 Typical Operating Curves
To be determined based on characterization.
SMSC EMC1212
11
DATASHEET
Revision 1.1 (02-07-07)
R EV IS IO N HISTO R Y
D
R E VI S ION
3
D E S CR IP TION
A
INITIA L R E LE A S E
D A TE
R E LE A S E D B Y
7 /07 /0 4
S .K .ILIE V
S EE D E T AIL "A "
6
N
3
4
E
E1
1
2
IN D E X A R EA
(D /2 x E 1/2)
3
e
5X b
2
4
4
c
5
E N D VIEW
T O P V IEW
12
DATASHEET
H
C
A2
G A U G E P LA N E
A
0 .2 5
NOT ES:
1. "N " IS T H E T O T A L N U M BER O F LEAD S .
2 . T R U E P O S IT IO N S P R E A D T O L E R A N C E IS ± 0 .10 m m A T M AXIMU M MAT ER IAL C O N D ITIO N .
3 . P A C K A G E B O D Y D IM E N S IO N "D " D O E S N O T IN C LU D E M O LD FLASH , PR O TR U SIO N S O R
G A T E B U R R S . M A X IM U M M O LD F LA S H , P R O T R U S IO N S O R G AT E BU R R S IS 0.25 m m PER
E N D . D IM E N S IO N "E 1" D O E S N O T IN C L U D E IN T ER LEAD F LAS H O R PR O T R U SIO N .
M A X IM U M IN T E R LE A D F LA S H O R P R O T R U S IO N IS 0 .25 m m PER SID E. "D 1" & "E1"
D IM E N S IO N S A R E D E T E R M IN E D AT D ATU M P LAN E "H ".
4 . D IM E N S IO N S "b " & "c " A P P L Y T O T H E F LA T S E C T IO N O F TH E LE AD BET W EE N 0.08 T O
0 .15 m m F R O M T H E LEAD TIP.
5 . D E T A ILS O F P IN 1 ID E N T IF IE R A R E O P T IO N A L , B U T M U ST BE LO C AT ED W ITH IN TH E
IN D E X A R E A IN D IC A T E D (SEE TO P VIEW ).
6 . F IV E L E A D P A C K A G E IS A V E R S IO N O F 6 L E A D P A C K A G E, W H ER E LEAD #5 H AS BEEN
R E M O V E D F R O M 6 L EAD PAC KAG E.
S EA TIN G P LA N E
A1
L
c cc C
0
L1
S ID E V IEW
D E T A IL "A " (S C ALE: 2/1)
UN LE S S O THE RW IS E S PE CIFIE D
D IM E NS I ONS AR E IN M ILL IM E TE RS
A ND TO LE R ANC E S A RE :
D E CIM A L
± 0.1
X .X
± 0.05
X .X X
X .X X X ± 0.025
T HIRD A NG LE P RO JE CT IO N
8 0 A R KA Y DRIV E
H A UP PA U GE , NY 11 788
US A
A NG UL A R
± 1°
T ITLE
N AM E
D IM A ND TO L P ER A S M E Y 14 .5M - 19 94
SMSC EMC1212
M AT E R IAL
N = 5 L EAD S
N = 6 LE AD S
F IN ISH
3-D V IEW S
-
P RIN T W ITH "S CA L E T O FIT"
DO N OT S CA LE D RA W ING
D ATE
D RA W N
S .K .IL IEV
7 /06 /0 4
C HE CK ED
S .K .IL IEV
D WG N UMBER
S CA LE
7 /07 /0 4
Figure 5.1 EMC1212 Package Outline and Parameters
R EV
M O -5/6 S O T -2.9x1.6
7 /06 /0 4
A P P R O VED
S .K .IL IEV
P A CK A G E O U T LINE : 5/6 P IN S O T
1 .6 m m B O D Y W IDT H, 0 .95m m P ITC H
S T D C O M PLIANCE
1:1
JE D E C : M O -1 78 / A A, A B
A
S H E ET
1 OF 1
BBUS Compliant Dual Temperature Monitor with Beta Compensation
Datasheet
Revision 1.1 (02-07-07)
Chapter 5 Package Drawing
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
DATASHEET
Revision 1.1 (02-07-07)