W83772G
Nuvoton
H/W Monitoring IC
Date: 07/01/2008
Revision: 1.3
W83772G
W83772G Data Sheet Revision History
PAGES
DATES
VERSION
VERSION ON
WEB
n.a.
07/26/05
0.1
NA
2
08/10/05
0.2
For Nuvoton internal use only
3
08/25/05
0.31
For Nuvoton internal use only
4
10/31/05
0.32
1. Change part number
W83L772G to W83772G.
1
MAIN CONTENTS
For Nuvoton internal use only
from
2. Modify the top marking
5
03/01/06
0.5
Preliminary datasheet.
1. Update Chap 3.
2. Update Chap7.6 and Chap 7.7
description.
3. Add Chap 7.3
6
04/27/06
4. Add Chap 8: PCB Layout Guide
1.0
5. Update Chap 9
6. Update
Chap
10.2:
DC
Characteristic Table for SST,
ADDx and D+ pin
7. Add Chap 11: Order Information
7
8
9
07/20/06
10/05/06
07/01/08
1.1
1.2
1.
Add Chap 9.1~9.5 “format of
command”.
2.
Modify
Chap
Characteristics
3.
Modify
the
description
1.
Fix typo and format.
2.
Update top marking diagram
from 772W to 772G
1.
Change from
Nuvoton
2.
Fix typo
1.3
-I-
10.3
Top
AC
Marking
Winbond
to
Publication Release Date: July, 2008
Version: 1.3
W83772G
Table of Content1.
GENERAL DESCRIPTION ......................................................................................................... 1
2.
FEATURES ................................................................................................................................. 1
2.1
Monitoring Items - Temperature .................................................................................................1
2.2
General ........................................................................................................................................1
2.3
Package .......................................................................................................................................1
3.
KEY SPECIFICATIONS .............................................................................................................. 1
4.
BLOCK DIAGRAM ...................................................................................................................... 2
5.
PIN CONFIGURATION ............................................................................................................... 2
6.
PIN DESCRIPTION ..................................................................................................................... 3
7.
FUNCTIONAL DESCRIPTION.................................................................................................... 3
7.1
General Description ....................................................................................................................3
7.2
Access Interface ..........................................................................................................................3
7.3
Power-On Reset ..........................................................................................................................4
7.4
Measured Temperature Data Format ........................................................................................4
7.5
Sensor Error Conditions..............................................................................................................5
7.6
Conversion Time .........................................................................................................................5
7.7
Address Selection .......................................................................................................................5
8.
PCB LAYOUT GUIDE ................................................................................................................. 6
9.
COMMAND SUMMARY .............................................................................................................. 7
10.
9.1
Format of PING() .........................................................................................................................7
9.2
Format of ResetDevice().............................................................................................................8
9.3
Format of GetIntTemp() ..............................................................................................................8
9.4
Format of GetExtTemp() .............................................................................................................9
9.5
Format of GetAllTemp() ........................................................................................................... 10
ELECTRICAL CHARACTERISTIC ........................................................................................... 11
10.1
Absolute Maximum Ratings ..................................................................................................... 11
10.2
DC Characteristics ................................................................................................................... 11
10.3
AC Characteristics.................................................................................................................... 12
11.
ORDER INSTRUCTION ............................................................................................................ 13
12.
TOP MARKING SPECIFICATION ............................................................................................ 13
13.
PACKAGE SPECIFICATION .................................................................................................... 14
- II -
Publication Release Date: July, 2008
Version: 1.3
W83772G
1. GENERAL DESCRIPTION
W83772G is a 2-channel temperature sensor with Simple Serial Transport (SST) interface. W83772G
has an on-chip thermal sensor and a remote temperature sensor. The remote temperature sensor
input could be connected to thermal diode or transistor such as 2N3904. A 10-bit ADC (Analog-toDigital Converter) is built inside W83772G to convert the monitored temperature value with 0.125C
resolution.
W83772G is a high precision, low-power consumption IC supporting 1.5V SST interface. The package
type is 8-pin, MSOP (TSSOP), and the operating voltage is 3.3 V ±10%.
2. FEATURES
2.1
Monitoring Items - Temperature
2.2
General
2.3
Measure temperature with high accuracy
One on-chip thermal sensor
One remote temperature sensor
3.3V±10% VCC operation
16-bit two’s complement data format, 0.125C resolution
Two address selection pins
Support Simple Serial Transport interface
Package
8-pin MSOP (TSSOP)
3. KEY SPECIFICATIONS
On-chip temperature range and accuracy
0C to 70C
3C (over entire range)
1C (40C to 70C)
Remote temperature range and accuracy
-30C to +127.875C
3C (over entire range)
1C (40C to 90C)
Supply voltage
3.3V ±10%
Operating supply current
5.6 mA typ.
ADC resolution
10 Bits
Operating Temperature Range
0C to 70C
-1-
Publication Release Date: July, 2008
Version: 1.3
W83772G
4. BLOCK DIAGRAM
VCC
xI
Command
Control
SST
Coder / Decoder
Logic
SST
Local / Remote
BANK
Temperature
SW
Registers
ADD0
D+
Sensor
D-
ADC
Circuit
Configuration
Address Selector
ADD1
Registers
Status
Registers
Internal
Thermal
Diode
5. PIN CONFIGURATION
VCC
1
GND
2
D+
3
D-
4
W83772G
8
SST
7
ADD0
6
RES
5
ADD1
-2-
Publication Release Date: July, 2008
Version: 1.3
W83772G
6. PIN DESCRIPTION
PIN NAME
NO
PIN TYPE
DESCRIPTION
VCC
1
POWER
GND
2
GROUND
D+
3
AIN
Connect to Thermal Diode Anode
D-
4
AIN
Connect to Thermal Diode Cathode
ADD1
5
IO
RES
6
ADD0
7
IO
For Address select
SST
8
IO
Simple Serial Transport (SST) Interface
DC Power Supply Voltage Input 3.3V10%.
Power Supply Ground
For Address select
Reserved
7. FUNCTIONAL DESCRIPTION
7.1
General Description
The W83772G provides one remote temperature sensor input which could be connected to 2N3904
transistor, or CPU/GPU thermal diode, and one local on-chip thermal sensor to detect ambient
temperature.
The data format of monitored temperature is 16-bit 2’s complement. The system interface is the 1-wire
SST access interface.
7.2
Access Interface
The W83772G provides SST interface to read/write internal registers, and the SST address is
xxxxxxxxb, respectively. Please refer to 7.7 Address Selection.
-3-
Publication Release Date: July, 2008
Version: 1.3
W83772G
7.3
Power-On Reset
The power-on reset threshold is 2.7V (typical). When Vcc crosses this threshold, the internal reset
signal will be asserted for 4mS. During this time period, W83772G is in the reset state. When the
internal reset signal is de-asserted, W83772G is in the operating state.
In the operating state, if Vcc drops below 2.4V and then rises above 2.7V, the internal reset signal will
be asserted immediately. Figure 1 illustrates the reset mechanism.
.
3.3V
VCC
2.7V
2.4V
0V
3.3V
2.7V
Internal Reset Signal
4ms
4ms
Figure 1.
7.4
Measured Temperature Data Format
The W83772G temperature data format of both remote and local temperature is 16-bit two’s
complement format.
Table 1 shows some representative temperature data with 16-bit two’s complement data format.
TEMPERATURE
16-BIT DIGITAL OUTPUT
+80°C
0001 0100 00
00 0000
+79.875°C
0001 0011 11
11 1000
+1°C
0000 0000 01
00 0000
+0°C
0000 0000 00
00 0000
-1°C
1111 1111 11
00 0000
- 5°C
1111 1110 11
00 0000
Integer Value
Fractional Value
Table 1. Temperature Data Format
-4-
Publication Release Date: July, 2008
Version: 1.3
W83772G
7.5
Sensor Error Conditions
When the external diode is opened or shorted, the W83772G will return 0x8001 in response to either
the SST command GetExtTemp() or GetAllTemp() command. It will also return 0x8002/0x8003 when
detecting temperature below -128°C /above +128°C.
7.6
Conversion Time
W83772G provides 250mS conversion time for monitoring all temperature readings. The conversion
time is related to the internal self-generated clock. The internal clock frequency is dependent on the
temperature. There is 10% frequency deviation in the operating temperature range of 0°C and 70°C.
7.7
Address Selection
W83772G has two address pins. These pins may be either tied to Vcc, ground or left open. After the
internal reset ends, pin ADD0/ADD1 will start to drive and sink current to detect the pin status – HIGH,
LOW or FLOATING and then decide the SST address of W83772G. The address will be retained as
long as the VCC of W83772G is maintained. The recommended pull-up or pull-down resistor value is
330Ω. (Please refer to the DC specification for the source and sink current.) The pull-up power plane
must be the same as the VCC power of W83772G.
VCC
VCC
R=330Ω
VCC
VCC
ADDx
GND
ADDx
GND
W83772G
W83772G
R=330Ω
VCC
VCC
ADDx
NC(Floating)
GND
W83772G
Figure 2.
-5-
Publication Release Date: July, 2008
Version: 1.3
W83772G
The address mapping is shown in the following table.
ADD0
ADD1
ADDRESS
Ground
Ground
0x48h
Floating
Ground
0x49h
Vcc
Ground
0x4ah
Ground
Floating
0x4bh
Floating
Floating
0x4ch
Vcc
Floating
0x4dh
Ground
Vcc
0x4eh
Floating
Vcc
0x4fh
Vcc
Vcc
0x50h
8. PCB LAYOUT GUIDE
Pin 3 & Pin 4 are typically connected to a thermal diode. Here are some recommendations for optimal
operation:
a) Place remote diode as close as possible to W83772G
b) Route D+ and D- lines away from clock generators, memory buses, or any high frequency buses
c) Place shield traces, which are connecting to board ground, flanking D+/D- to shield the noise
d) It is recommended that the bypass capacitor with 2200pF should be placed close to W83772G to
filter the noise from motherboard digital signals
e) Place a 0.1uF bypass capacitor close to the VCC pin
The connection diagram is shown as the following
GND
W83772G
D+
2200pf
DGND
Figure 3.
-6-
Publication Release Date: July, 2008
Version: 1.3
W83772G
9. COMMAND SUMMARY
The following table shows the supported SST commands.
COMMAND
Ping()
DESCRIPTION
Return a non-zero FCS over the header
ResetDevice()
Perform a functional reset similar to power-on reset
GetIntTemp()
Return the temperature of W83772G internal thermal sensor
GetExtTemp()
Return the temperature of W83772G external thermal diode
GetAllTemps()
Return a 4-byte block of data (internal plus external temperatures)
The following sections will show the format of each command. For more terminology and information,
please refer to Simple Serial Transport Specification.
9.1
Format of PING()
Target
Address
Write Length
Read Length
(0x00)
(0x00)
-7-
FCS
Publication Release Date: July, 2008
Version: 1.3
W83772G
9.2
Format of ResetDevice()
Target
Address
Write Length
Read Length
(0x01)
(0x00)
Reset Device
Command
FCS
(0xf6)
9.3
Format of GetIntTemp()
Target
Address
Write Length
Read Length
(0x01)
(0x02)
GetIntTemp
Command
(0x00)
…
FCS
LSB Data
MSB Data
-8-
FCS
Publication Release Date: July, 2008
Version: 1.3
W83772G
9.4
Format of GetExtTemp()
Target
Address
Write Length
Read Length
(0x01)
(0x02)
GetExtTemp
Command
(0x01)
…
FCS
LSB Data
MSB Data
-9-
FCS
Publication Release Date: July, 2008
Version: 1.3
W83772G
9.5
Format of GetAllTemp()
Target
Address
Write Length
Read Length
(0x01)
(0x04)
GetAllTemp
Command
(0x00)
…
…
FCS
Int. LSB
Data
Int. MSB Data
Ext. LSB
Data
Ext. MSB
Data
FCS
- 10 -
Publication Release Date: July, 2008
Version: 1.3
W83772G
10. ELECTRICAL CHARACTERISTIC
10.1 Absolute Maximum Ratings
PARAMETER
RATING
UNIT
Power Supply Voltage
3.63
V
Operating Temperature
70
C
Storage Temperature
-30
to
C
+127.875
Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability
of the device.
10.2 DC Characteristics
(Ta = 0 C to 70 C, Vcc = 3.3V 10%, GND = 0V)
PARAMETER
SYM.
MIN.
TYP.
MAX.
UNIT
CONDITIONS
This set of DC electrical specifications is used with devices normally
operating from a +1.5V interface supply voltage. The following voltage and current
requirements refer to the SST electrical model. For the purpose of bus
capacitance, the electrical model is a two-node circuit. One node is counted for
each client and one node for the system host. VSSTIO is the internally generated
+1.5V supply voltage for the SST interface.
SST -
IO pad power
supply
VSSTIO
1.40
1.50
1.60
Input Voltage range
Vin
Input Low
Threshold Voltage
Vt-
Input High
Threshold Voltage
Vt+
Hysteresis
VTH
0.15
V
Output source
current
Isource
-6.0
mA
Voh=1.1V, VSSTIO =1.4V
Input High Leakage
ILIH
+10
A
VSST = VSSTIO
Input Low Leakage
ILIL
-10
A
VSST = 0V
VSSTIO +0.3
0.40
0.65
V
VSSTIO = 1.4V (MIN)
VSSTIO = 1.6V (MAX)
0.8
1.10
V
VSSTIO = 1.4V (MIN)
VSSTIO = 1.6V (MAX)
- 11 -
Publication Release Date: July, 2008
Version: 1.3
W83772G
PARAMETER
SYM.
MIN.
TYP.
3.30
MAX.
UNIT
CONDITIONS
ADDx
Power Supply Voltage
Vcc
2.97
Input Voltage range
Vin
-0.3
Input High Voltage
Vth
1.95
3.63
V
Vcc+0.3
V
V
Input Low Voltage
1.35
V
Output source current
Isource
-0.7
-3
mA
Voh=2.4V, Vcc=2.97V
Output sink current
Isink
0.7
2
mA
Vol=0.4V, Vcc=2.97V
PARAMETER
SYM.
MIN.
TYP.
MAX.
UNIT
CONDITIONS
D+
Ouput Current I1
I1
15
uA
Vcc = 3.3 V
Output Current I2
I2
165
uA
Vcc = 3.3 V
10.3 AC Characteristics
Bus Rate: 1MHz (typical)
Refer to the specification of Simple Serial Transport (SST) specification.
- 12 -
Publication Release Date: July, 2008
Version: 1.3
W83772G
11. ORDER INSTRUCTION
PART NO.
PACKAGE
REMARKS
W83772G
MSOP8
Pb-free Package
12. TOP MARKING SPECIFICATION
The top marking of W83772G
772G
LUA
625B
1st line: type number: 772G
2nd line: assembly house ID(L) + internal code(UA)
L: Lingsen
UA: internal code
3rd line: Tracking code
626 B
625: packages made in '06, week 25
B: IC revision; A means version A, B means version B
- 13 -
Publication Release Date: July, 2008
Version: 1.3
W83772G
13. PACKAGE SPECIFICATION
MSOP 8L 3mm X 3mm
- 14 -
Publication Release Date: July, 2008
Version: 1.3
W83772G
Important Notice
Nuvoton Products are neither intended nor warranted for usage in systems or equipment, any
malfunction or failure of which may cause loss of human life, bodily injury or severe property
damage. Such applications are deemed, “Insecure Usage”.
Insecure usage includes, but is not limited to: equipment for surgical implementation, atomic
energy control instruments, airplane or spaceship instruments, the control or operation of
dynamic, brake or safety systems designed for vehicular use, traffic signal instruments, all
types of safety devices, and other applications intended to support or sustain life.
All Insecure Usage shall be made at customer’s risk, and in the event that third parties lay
claims to Nuvoton as a result of customer’s Insecure Usage, customer shall indemnify the
damages and liabilities thus incurred by Nuvoton.
- 15 -
Publication Release Date: July, 2008
Version: 1.3
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