NCT7718W
Nuvoton
Thermal Sensor IC
Date: Jan/11/2013
Revision: 1.1
NCT7718W
NCT7718W Datasheet Revision History
PAGES
1
DATES
05/26/09
VERSION
MAIN CONTENTS
0.2
1st release
2
01/07/10
0.3
Modified the registers default value and the
hardware strapping resistor value.
3
05/02/10
0.4
Modified some specifications and hardware
strapping resistor value
07/21/10
0.5
Update the key specification and add the top
marking specification
4
2, 20
Update some statements
5
09/15/10
1.0
6
04/11/11
1.01
Add the taping specification & update the
ordering information
All versions before 1.0 are preliminary
versions
7
21
02/09/12
1.02
Add the mold flash spec
8
18
1/11/13
1.1
Add the ESD protection info.
-I-
Release Date: Feb., 2013
Version: 1.1
NCT7718W
Table of Content1.
GENERAL DESCRIPTION ......................................................................................................... 1
2.
FEATURES ................................................................................................................................. 1
2.1
Temperature Measurement ..................................................................................................... 1
2.2
Over Temperature .................................................................................................................... 1
2.3
General ..................................................................................................................................... 1
3.
KEY SPECIFICATIONS .............................................................................................................. 2
4.
PIN CONFIGURATION ............................................................................................................... 2
5.
PIN DESCRIPTION..................................................................................................................... 3
6.
5.1
PIN TYPE DISCRIPTION ........................................................................................................ 3
5.2
PIN DISCRIPTION ................................................................................................................... 3
FUNCTION DESCRIPTION ........................................................................................................ 4
6.1
General Description.................................................................................................................. 4
6.2
Access Interface ....................................................................................................................... 4
Data write to the internal register .............................................................................. 4
6.2.2
Data read from the internal register .......................................................................... 4
6.3
Address Setting ........................................................................................................................ 5
6.4
Temperature Measurement Data Format................................................................................ 5
6.5
7.
6.2.1
6.4.1
The local temperature (on-die) data with 8-bit 2`s complement format. .................... 5
6.4.2
The remote temperature data with 11-bit 2`s complement format. ........................... 5
ALERT# Output ........................................................................................................................ 6
6.5.1
ALERT# Output Comparator Mode .......................................................................... 6
6.5.2
ALERT# Output Interrupt Mode ................................................................................ 6
6.5.3
ALERT# Output SMBus alert Mode .......................................................................... 7
6.5.4
T_CRIT# Output ....................................................................................................... 7
REGISTER SUMMARY .............................................................................................................. 8
7.1
Register Map ............................................................................................................................ 8
7.2
Register Detail .......................................................................................................................... 9
7.2.1
Register: Local Diode Temperature Readout ........................................................... 9
7.2.2
Register: Remote Diode 1 Temperature Readout (MSB) ......................................... 9
7.2.3
Register: Alert Status ................................................................................................ 9
7.2.4
Register: Configuration ........................................................................................... 10
7.2.5
Register: Conversion Rate...................................................................................... 11
7.2.6
Register: Local Diode Temperature Alert Temperature .......................................... 11
7.2.7
Register: Remote Diode 1 Temperature High Alert Temperature (MSB) ................ 11
7.2.8
Register: Remote Diode 1 Temperature Low Alert Temperature (MSB) ................ 12
7.2.9
Register: One Shot Conversion .............................................................................. 12
7.2.10
Register: Remote Diode 1 Temperature Readout (LSB) ........................................ 12
7.2.11
Register: Remote Diode 1 Temperature Offset Register (MSB) ............................. 12
7.2.12
Register: Remote Diode 1 Temperature Offset Register (LSB) .............................. 13
- II -
Release Date: Feb., 2013
Version: 1.1
NCT7718W
8.
7.2.13
Register: Remote Diode 1 Temperature High Alert Temperature (LSB) ................. 13
7.2.14
Register: Remote Diode 1 Temperature Low Alert Temperature (LSB) ................. 13
7.2.15
Register: Alert Mask ............................................................................................... 14
7.2.16
Register: Remote Diode 1 Critical Temperature ..................................................... 15
7.2.17
Register: Local Diode Critical Temperature ............................................................ 15
7.2.18
Register: Critical Temperature Hysteresis .............................................................. 16
7.2.19
Register: Customer Data Log Registers ................................................................. 16
7.2.20
Register: Remote Diode Temperature Filter and Alert Mode Setting ...................... 16
7.2.21
Register: Chip ID .................................................................................................... 17
7.2.22
Register: Vendor ID ................................................................................................ 17
7.2.23
Register: Device ID ................................................................................................. 17
ELECTRICAL CHARACTERISTICS ......................................................................................... 18
8.1
Absolute Maximum Ratings ...................................................................................................18
8.2
DC Characteristics .................................................................................................................18
8.3
AC Characteristics..................................................................................................................19
9.
ORDERING INFORMATION..................................................................................................... 20
10.
TOP MARKING SPECIFICATION ............................................................................................ 20
11.
TAPING SPECIFICATION ........................................................................................................ 20
12.
PACKAGE DRAWING AND DIMENSIONS .............................................................................. 21
- III -
Release Date: Feb., 2013
Version: 1.1
NCT7718W
1. GENERAL DESCRIPTION
NCT7718W is a temperature sensor with one local and one remote sensor; the remote temperature
sensor input could be connected to thermal diode or transistor, such as 2N3904. A 10-bit ADC
(Analog-to-Digital Converter) is built inside NCT7718W to convert the monitored temperature value
with 0.125C resolution.
Additionally, the NCT7718W supports 2-wire System Management Bus (SMBusTM) series interface,
and it also provides the hardware thermal alert or system shutdown via ALERT# and T_CRIT# pin.
The NCT7718W is a high precision, low-power consumption IC supporting SMBusTM interface, which
is specifically designed for the PC, Notebook applications, and any embedded environments. Its
available package is 8-pin MSOP, with the working voltage of 3.3V.
2. FEATURES
2.1
Temperature Measurement
Measure the temperature with high accuracy
One local on-die thermal sensor
One remote temperature sensor with current mode
2.2
Over Temperature
Supports 2 alert outputs : ALERT# and T_CRIT#
T_CRIT# point supports Hardware Power-on setting
ALERT# output supports SMBusTM 2.0 ARA function
2.3
General
2
I C® Compatible System Management bus (SMBusTM)
3.3V±5% VDD operation
8-pin MSOP Green Package (Halogen-free)
-1-
Release Date: Feb., 2013
Version: 1.1
NCT7718W
3. KEY SPECIFICATIONS
PARAMETER
RATING
-40C to +125C (TA)
Local temperature range and accuracy
Typ. 2C (20C~40C)
Max. 3C (-40C~125C) *1
-40C to +127C (TD)
Remote temperature range and accuracy
Typ. 1C (25C ~70C)
Typ. 2C (-40C ~127C)
Max. 3C (-40C~127C) *2
Supply voltage
3.3V ± 5%
Operating supply current
1.2 mA typ.
ADC resolution include sign bit
10 Bits
*1 Guaranteed by design from -40~125 degreeC, 100% tested at 85 degreeC.
*2 Guaranteed by design from -40~127 degreeC, 100% tested at 85 degreeC.
4. PIN CONFIGURATION
-2-
Release Date: Feb., 2013
Version: 1.1
NCT7718W
5. PIN DESCRIPTION
5.1
PIN TYPE DISCRIPTION
PIN TYPE
OD12
Open-drain output pin with 12 mA sink capability
INts
TTL level input pin and Schmitt-trigger
AIN
Input pin (Analog)
P
5.2
PIN ATTRIBUTE
Power or Ground Pin
PIN DISCRIPTION
PIN NO.
PIN NAME
I/O
FUNCTION
1
VDD
P
2
D+
AIN
Connect to Thermal Diode Anode
3
D-
AIN
Connect to Thermal Diode Cathode
4
T_CRIT#
OD12
T_CRIT alarm output, for interrupt or shutdown
control
5
GND
P
6
ALERT#
OD12
7
SDA
INts/ OD12
8
SCL
INts
DC Power supply, Voltage input 3.3V±5%
Power supply ground
Alarm output, for interrupt control
SMBusTM bi-directional data
SMBusTM Clock
-3-
Release Date: Feb., 2013
Version: 1.1
NCT7718W
6. FUNCTION DESCRIPTION
6.1
General Description
NCT7718W is SMBusTM interface device to provide on-die temperature sensor and 1 set of thermal
inputs for CPU/GPU thermal diode sensor, 2 wire alert signals which ALERT# is for processor event
notification and T_CRIT# is for thermal shutdown.
6.2
Access Interface
NCT7718W provides SMBusTM to access the internal register, and supports SMBusTM byte write and
byte read protocols.
6.2.1
Data write to the internal register
6.2.2
Data read from the internal register
-4-
Release Date: Feb., 2013
Version: 1.1
NCT7718W
6.3
Address Setting
NCT7718W I2C/ SMBusTM address is 1001100xb (x is R/W bit).
6.4
Temperature Measurement Data Format
6.4.1
6.4.2
The local temperature (on-die) data with 8-bit 2`s complement format.
TEMPERATURE
8-BIT DIGITAL OUTPUT
+127°C
0111,1111
+25°C
0001,1001
+2°C
0000,0010
+1°C
0000,0001
+0°C
0000,0000
- 1°C
1111,1111
- 2°C
1111,1110
- 25°C
1110,0111
- 128°C
1000,0000
The remote temperature data with 11-bit 2`s complement format.
TEMPERATURE
8-BIT DIGITAL OUTPUT HIGH BYTE
3-BIT DIGITAL OUTPUT LOW BYTE
+127.875°C
0111,1111
111X,XXXX
+25.750°C
0001,1001
110X,XXXX
+2.250°C
0000,0010
010X,XXXX
+1.125°C
0000,0001
001X,XXXX
+0.000°C
0000,0000
000X,XXXX
- 1.125°C
1111,1110
111X,XXXX
- 2.250°C
1111,1101
110X,XXXX
- 25.750°C
1110,0110
010X,XXXX
- 127.875°C
1000,0000
001X,XXXX
-5-
Release Date: Feb., 2013
Version: 1.1
NCT7718W
6.5
ALERT# Output
The NCT7718W ALERT# pin is an active-low open-drain output pin which is triggered when measured
temperature exceeds the limitation defined in the limit registers. There are three types of ALERT#
output mode: the ALERT# output comparator mode, the ALERT# output interrupt mode, and the
ALERT# output SMBusTM ALERT# mode.
6.5.1
ALERT# Output Comparator Mode
Figure 1 shows the mechanism of the ALERT# output comparator mode. In this mode, the ALERT#
pin will be alerted if the monitored temperature is out-of-limit and the ALERT# pin keeps low until the
temperature goes back to the target range.
Figure 1
6.5.2
ALERT# Output Interrupt Mode
Figure 2 shows the mechanism of the ALERT# output interrupt mode. In this mode, the NCT7718W
will set the ALERT mask bit of Configuration Register during a read of the Status Register if any flag in
Status Register, except the ADC_Busy flag and Remote Diode Open flag, is set. This prevents further
ALERT# triggering until the master has reset the ALERT mask bit (write 0 to Alert_MSK), at the end of
the interrupt service routine. The Status Register flags are cleared only upon a read Status Register
command from the master and will be re-alerted at the end of the next temperature conversion if the
measured temperature still falls outside of the allowed range.
Figure 2
-6-
Release Date: Feb., 2013
Version: 1.1
NCT7718W
6.5.3
ALERT# Output SMBus alert Mode
Figure 3 shows the mechanism of the ALERT# output SMBusTM alert mode. In this mode, the ALERT#
output of the NCT7718W is connected to the SMBusTM alert line which has more than one device
connected to it. Through such and implementation, SMBusTM alert mode can assist the master in
resolving which salve generates an interrupt. When the measured temperature falls outside of the
allowed range, the ALERT# pin will be pulled low and the corresponding alert flags in Status Register
will be set to 1. The ALERT mask bit will just be set if there is a read command for Status Register or
when SMBusTM ALERT Response Address (ARA) occurs from master (Alert Response Address is
0001100x). Meanwhile, the NCT7718W will generate and return its own address to the master. If the
temperature never falls outside of the allowed range, the latched ALERT# pin can release by the reset
ALERT mask bit and the latched corresponding alert flags in Status Register can release by reading
command for Status Register.
Figure 3
6.5.4
T_CRIT# Output
T_CRIT# output pulls low when the measured temperature exceeds the critical temperature setting.
Once the T_CRIT# output pulls low, it will not be set high until the measured temperature is lower than
“T_CRIT – TH”, where TH is Temperature Hysteresis. Status Register will not be reset until it is read
and the temperature conversion falls below the T_CRIT set point, the ALERT-MSK bit of Configuration
Register will be set after Status Register read. Figure 4 shows this mechanism.
Figure 4
-7-
Release Date: Feb., 2013
Version: 1.1
NCT7718W
7. REGISTER SUMMARY
7.1
Register Map
Idx Register Name
Attr Dft
7
6
5
4
3
2
1
STS_RT1LA
STS_RT1O
STS_RT1C
STS_LC
Reserved
EN_RT1
EN_WTC
EN_FaultQueue
0
LDT Readout
RO
00
MNTREG_LT[7:0]
1
RT1 Temp MSB
RO
00
MNTREG_RT1[10:3]
2
Alert Status
RO
00
3
Configuration [R]
RW
25 ALERT_MSK STOP_Mnt
4
Conversion
[R]
RW
08
5
LT Alert Temp [R]
RW
46
6
Reserved
7
RT1
High Alert
Temp MSB [R]
RW
46
RT1_HAT[10:3]
8
RT1
Low Alert
Temp MSB [R]
RW
D8
RT1_LAT[10:3]
9
Configuration [W]
RW
25 ALERT_MSK STOP_Mnt
A
Conversion
[W]
RW
08
B
LT Alert Temp [W]
RW
46
C
Reserved
D
RT1 High Alert
Temp MSB [W]
RW
46
RT1_HAT[10:3]
E
RT1
Low Alert
Temp MSB [W]
RW
D8
RT1_LAT[10:3]
F
One
Conversion
WO
FF
RO
00
RT1 Offset Temp
MSB
RW
00
RT1 Offset Temp
12
LSB
RW
00
OFFSET_RT1[2:0]
Reserved
RW
00
RT1_HAT[2:0]
Reserved
RW
00
RT1_LAT[2:0]
Reserved
16 Alert Mask
RW
07
19 RT1 Critical Temp
RW
-
RT1_CT[7:0]
20 LT Critical Temp
RW
-
LT_CT[7:0]
Rate
Rate
Shot
RT1 High
Temp LSB
Alert
14
RT1 Low
Temp LSB
Alert
Critical
Hysteresis
Reserved
STS_RT1HA
Reserved
Reserved
ConvRate[3:0]
LT_HAT[7:0]
Reserved
Reserved
Reserved
EN_RT1
EN_WTC
EN_FaultQueue
ConvRate[3:0]
LT_HAT[7:0]
Reserved
13
21
STS_LTHA
Reserved
10 RT1 Temp LSB
11
ADC_Busy
0
Temp
MNTREG_RT1[2:0]
Reserved
OFFSET_RT1[10:3]
MSK_LTH
Reserved
MSK_RT1H
MSK_RT1L
RW
0A
Customer
Data
2D
Log Register 1
Reserved
RW
00
CustomerLogReg1[7:0]
2E
Customer
Data
Log Register 2
RW
00
CustomerLogReg2[7:0]
2F
Customer
Data
Log Register 3
RW
00
CustomerLogReg3[7:0]
BF
RT Filter & Alert
mode
RW
00
FD CID (Chip ID)
RO
50
50h
FE VID (Vendor ID)
RO
50
50h
Reserved
MSK_RT1C
MSK_LC
CTH[4:0]
Reserved
RT1F
-8-
Alert_MD
Release Date: Feb., 2013
Version: 1.1
NCT7718W
FF DID (Device ID)
7.2
RO
90
90H
Register Detail
7.2.1
Register: Local Diode Temperature Readout
Location : Address 00h
Type : Read Only
Power on default value : 00
BIT
7
NAME
VALUE
7.2.2
6
5
4
3
2
1
0
Local Diode Temperature Readout Value. The real temperature value calculation is
referred to TEMPERATURE MEASUREMENT DATA FORMAT.
SIGN
64
32
16
8
4
2
1
2
1
0
Register: Remote Diode 1 Temperature Readout (MSB)
Location : Address 01h
Type : Read Only
Power on default value : 00
BIT
7
NAME
VALUE
7.2.3
6
5
4
3
Remote Diode 1 Temperature Readout Value. The real temperature value calculation is
referred to TEMPERATURE MEASUREMENT DATA FORMAT.
SIGN
64
32
16
8
4
2
1
Register: Alert Status
Location : Address 02h
Type : Read Only
Power on default value : 00
BIT
7
6
5
4
3
2
1
0
NAME
ADC_Bu
sy
STS_LT
HA
Reserved
STS_RT
1HA
STS_RT
1LA
STS_RT
1O
STS_RT
1C
STS_LC
DEFAULT
0
0
0
0
0
0
0
BIT
7
6
5
4
3
FLAG NAME
DESCRIPTION
ADC_Busy
If set to „1‟ indicates ADC is busy converting.
STS_LTHA
If set to „1‟ indicates a measured Local Diode Temperature Higher than Local
High set point (High Limit).
Reserved
STS_RT1HA
If set to „1‟ indicates a measured Remote Diode1 Temperature higher than
Remote High set point (High Limit).
STS_RT1LA
If set to „1‟ indicates a measured Remote Diode1 Temperature lower than
Remote Low set point (Low Limit).
-9-
Release Date: Feb., 2013
Version: 1.1
NCT7718W
BIT
FLAG NAME
DESCRIPTION
2
STS_RT1O
If set to „1‟ indicates a Remote Diode1 disconnect.
1
STS_RT1C
If set to „1‟ indicates a Remote Diode1 Critical Temperature alarm.
0
STS_LC
If set to „1‟ indicates a Local Diode Critical Temperature alarm.
7.2.4
Register: Configuration
Location : Address 03h and 09h
Type : Read/Write
Power on default value : 05
BIT
7
6
NAME
ALERT_
MSK
STOP_
Mnt
DEFA
ULT
0
0
BIT
5
4
3
Reserved
2
1
0
EN_RT1
EN_WTC
EN_Fault
Queue
1
0
1
DESCRIPTION
ALERT_MSK –. ALERT# function is enable
7
0 = Enable
1 = Disable
STOP_Mnt – Stop Monitor and entry Standby
6
0 = Monitor
1 = Stop Monitor
EN_RT1 – Enable Remote Diode 1 monitoring.
2
0 = Disable
1 = Enable
EN_WTC– Enable Override POR Value of Critical Temperature
1
0 = Disable
1 = Enable
EN_Fault Queue–Enable Fault Queue function.
0
0 = Disable. ALERT# and T_CRIT# will be generated if monitor result of any channel is
above or below high/low set point.
1 = Enable. ALERT# and T_CRIT# will be generated if monitor result of any channel is
three successive times above or below high/low set point.
- 10 -
Release Date: Feb., 2013
Version: 1.1
NCT7718W
7.2.5
Register: Conversion Rate
Location : Address 04h and 0Ah
Type : Read/Write
Power on default value : 08
BIT
7
6
5
4
3
Reserved
NAME
1
0
ConvRate
1
DEFAULT
7.2.6
2
0
0
BIT
FREQUENCY/TIME
00h
0.0625Hz / 16sec
01h
0.125Hz / 8sec
02h
0.25Hz / 4sec
03h
0.5Hz / 2sec
04h
1Hz / 1sec
05h
2Hz / 0.5sec
06h
4Hz / 0.25sec
07h
8Hz / 0.125sec
08h
16Hz / 0.0625sec
09h-FFh
Reserved
0
Register: Local Diode Temperature Alert Temperature
Location : Address 05h and 0Bh
Type : Read/Write
Power on default value : 46
BIT
7
6
5
SIGN
64
32
2
1
0
16
8
4
2
1
46h (70℃)
DEFAULT
7.2.7
3
LDT Alert Temperature
NAME
VALUE
4
Register: Remote Diode 1 Temperature High Alert Temperature (MSB)
Location : Address 07h and 0Dh
Type : Read/Write
Power on default value : 46
BIT
7
6
DEFAULT
4
3
2
1
0
2
1
RT1 High Alert Temperature High Byte
NAME
VALUE
5
SIGN
64
32
16
8
4
46h (70℃)
- 11 -
Release Date: Feb., 2013
Version: 1.1
NCT7718W
7.2.8
Register: Remote Diode 1 Temperature Low Alert Temperature (MSB)
Location : Address 08h and 0Eh
Type : Read/Write
Power on default value : D8
BIT
7
6
5
3
2
1
0
2
1
RT1 Low Alert Temperature High Byte
NAME
SIGN
VALUE
64
32
16
8
4
D8h (-40℃)
DEFAULT
7.2.9
4
Register: One Shot Conversion
Location : Address 0Fh
Type : Write Only
BIT
7-0
DESCRIPTION
One Shot Conversion – When enter Stop Monitor state, to fill any value into this register
will trigger one temperature conversion cycle.
7.2.10 Register: Remote Diode 1 Temperature Readout (LSB)
Location : Address 10h
Type : Read Only
Power on default value : 00
BIT
NAME
7
6
5
4
3
Remote Diode 1 Temperature Readout Value. The
real temperature value calculation is referred to
TEMPERATURE MEASUREMENT DATA FORMAT.
0.5
VALUE
0.25
2
1
0
Reserved
0.125
0
7.2.11 Register: Remote Diode 1 Temperature Offset Register (MSB)
Location : Address 11h
Type : Read/Write
Power on default value : 00
BIT
7
6
DEFAULT
4
3
2
1
0
4
2
1
RT1 OFFSET VALEU High Byte
NAME
VALUE
5
SIGN
64
32
16
8
00h
- 12 -
Release Date: Feb., 2013
Version: 1.1
NCT7718W
7.2.12 Register: Remote Diode 1 Temperature Offset Register (LSB)
Location : Address 12h
Type : Read/Write
Power on default value : 00
BIT
7
6
5
3
2
1
0
RT1 OFFSET VALUE Low Byte
NAME
VALUE
4
0.5
0.25
0.125
00h
DEFAULT
7.2.13 Register: Remote Diode 1 Temperature High Alert Temperature (LSB)
Location : Address 13h
Type : Read/Write
Power on default value : 00
BIT
7
6
4
3
2
1
0
RT1 High Alert Temperature Low Byte
NAME
VALUE
5
0.5
0.25
0.125
00h
DEFAULT
7.2.14 Register: Remote Diode 1 Temperature Low Alert Temperature (LSB)
Location : Address 14h
Type : Read/Write
Power on default value : 00
BIT
7
6
DEFAULT
4
3
2
1
0
RT1 Low Alert Temperature Low Byte
NAME
VALUE
5
0.5
0.25
0.125
00h
- 13 -
Release Date: Feb., 2013
Version: 1.1
NCT7718W
7.2.15 Register: Alert Mask
Location : Address 16h
Type : Read/Write
Power on default value : 07
BIT
7
NAME
MSK_LTH
DEFAULT
0
6
5
Reserved
BIT
4
3
2
1
0
MSK_RT
1H
MSK_RT
1L
Reserved
MSK_RT1
C
MSK_
LC
0
0
1
1
DESCRIPTION
MSK_LTH – Local Diode Temperature High Alert Mask
7
0 = Alert is not masked
1 = Alert is masked
MSK_RT1H– Remote Diode 1 Temperature High Alert Mask
4
0 = Alert is not masked
1 = Alert is masked
MSK_RT1L– Remote Diode 1 Temperature Low Alert Mask
3
0 = Alert is not masked
1 = Alert is masked
MSK_RT1C– Remote Diode 1 Temperature Critical Mask
1
0 = Alert is not masked
1 = Alert is masked
MSK_LC– Local Diode Temperature Critical Mask
0
0 = Alert is not masked
1 = Alert is masked
- 14 -
Release Date: Feb., 2013
Version: 1.1
NCT7718W
7.2.16 Register: Remote Diode 1 Critical Temperature
Location : Address 19h
Type : Read/Write
Power on default value : Power on strapping after power up 100ms
BIT
NAME
VALUE
7
6
5
4
3
2
1
0
RT1 Critical Temperature
The format of Temperature is 8-bit 2‟s complement and the range is -128℃~127℃.
SIGN
64
32
16
8
4
2
1
Hardware Strapping
DEFAULT
The default value is trapping after power up 100ms by different pull-up resistors of T_CRIT# and
ALERT# pin:
T_CRIT#
TEMPERATURE (℃)
2KΩ
7.5KΩ
ALERT#
10.5KΩ
14KΩ
18.7KΩ
2KΩ
7.5KΩ
10.5KΩ
14KΩ
18.7KΩ
77
79
81
83
85
87
89
91
93
95
97
99
101
103
105
107
109
111
113
115
117
119
121
123
125
7.2.17 Register: Local Diode Critical Temperature
Location : Address 20h
Type : Read/Write
Power on default value : Power on strapping after power up 100ms
BIT
NAME
VALUE
7
6
5
4
3
2
1
0
Local Diode Critical Temperature
The format of Temperature is 8-bit 2‟s complement and the range is -128℃~127℃.
SIGN
64
32
16
8
4
2
1
Hardware Strapping
DEFAULT
The default value is trapping after power up 100ms by different pull-up resistors of T_CRIT# and
ALERT# pin:
TEMPERATURE (℃)
2KΩ
7.5KΩ
ALERT#
10.5KΩ
14KΩ
18.7KΩ
T_CRIT#
2KΩ
7.5KΩ
10.5KΩ
14KΩ
18.7KΩ
77
79
81
83
85
87
89
91
93
95
97
99
101
103
105
107
109
111
113
115
117
119
121
123
125
- 15 -
Release Date: Feb., 2013
Version: 1.1
NCT7718W
7.2.18 Register: Critical Temperature Hysteresis
Location : Address 21h
Type : Read/Write
Power on default value : 0A
BIT
NAME
7
6
5
4
3
2
1
0
4
2
1
2
1
0
Critical Temperature Hystersis
The format of Temperature is 5-bit integer and the range is 0℃~31℃.
16
VALUE
8
0Ah (10℃)
DEFAULT
7.2.19 Register: Customer Data Log Registers
Location : Address 2Dh 2Eh 2Fh
Type : Read/Write
Power on default value : 00
BIT
7
6
5
4
3
NAME
Customer Data Log Register
DEFAULT
00h
7.2.20 Register: Remote Diode Temperature Filter and Alert Mode Setting
Location : Address BFh
Type : Read/Write
Power on default value : 00
BIT
NAME
7
6
5
4
3
Reserved
2
1
RT1F
DEFAULT
00h
BIT
DESCRIPTION
0
ALERT_MD
RT1F – Remote diode temperature 1 filter setting
2-1
00 = No filter selected
01 or 10 = Filter level 1 selected
11 = Filter level 2 selected
ALERT_MD – ALERT mode configuration
0
0 = Interrupt or SMBus alert mode
1 = Comparator mode
- 16 -
Release Date: Feb., 2013
Version: 1.1
NCT7718W
7.2.21 Register: Chip ID
Location : Address FDh
Type : Read Only
Power on default value : 50
BIT
7-0
DESCRIPTION
Chip ID
Chip ID of NCT7718W is 50h
7.2.22 Register: Vendor ID
Location : Address FEh
Type : Read Only
Power on default value : 50
BIT
7-0
DESCRIPTION
Vendor ID
Vendor ID of NCT7718W is 50h
7.2.23 Register: Device ID
Location : Address FFh
Type : Read Only
Power on default value : 9x
BIT
7-0
DESCRIPTION
Device ID
Device ID of NCT7718W is 9xh (x=0,1,2…..)
- 17 -
Release Date: Feb., 2013
Version: 1.1
NCT7718W
8. ELECTRICAL CHARACTERISTICS
8.1
Absolute Maximum Ratings
PARAMETER
RATING
UNIT
Power Supply Voltage
3.3V 5%
V
Input Voltage
-0.3 to +3.6
V
Operating Temperature
-40 to +125
C
Storage Temperature
-55 to +150
C
2
KV
Machine Mode
200
V
Latch-up
100
mA
Human Body Mode
ESD Protection
Note: Exposure to conditions beyond those listed under Absolute Maximum Ratings may adversely affect the life and reliability
of the device.
8.2
DC Characteristics
(Ta = 0 C to 70 C, VDD = 3.3V 5%, GND = 0V)
PARAMETER
SYM.
MIN.
TYP.
MAX.
UNIT
CONDITIONS
OD12 – Open-drain output pin with source-sink capability of 12 mA
Output Low Voltage
VOL
0.4
V
IOL = 12 mA
OUT12 - Output buffer pin with source-sink capability of 12 mA
Output Low Voltage
VOL
Output High Voltage
VOH
0.4
2.4
V
V
IOL = 12 mA
IOH = -12 mA
INts - TTL level Schmitt-triggered input pin
Input Low Voltage
VIL
Input High Voltage
VIH
Input High Leakage
ILIH
Input Low Leakage
ILIL
0.8
V
VDD = 3.3V
V
VDD = 3.3V
+10
A
VIN=3.3V
-10
A
VIN=0V
2.0
- 18 -
Release Date: Feb., 2013
Version: 1.1
NCT7718W
8.3
AC Characteristics
SMBusTM Interface
PARAMETER
SCL clock period
SYMBOL
-
MIN.
MAX.
UNIT
t SCL
2.5
uS
Start condition hold time
tHD;SDA
1.5
uS
Stop condition setup-up time
tSU;STO
1
uS
DATA to SCL setup time
tSU;DAT
120
nS
DATA to SCL hold time
tHD;DAT
5
nS
SCL and SDA rise time
tR
1.0
uS
SCL and SDA fall time
tF
300
nS
- 19 -
Release Date: Feb., 2013
Version: 1.1
NCT7718W
9. ORDERING INFORMATION
PART NO.
NCT7718W
PACKAGE
MSOP, 8pin
Green package
SHIPPING SHAPE
MOQ
Tape & Reel
4,000 units
PRODUCTION FLOW
Commercial,
0℃ to +70℃
10. TOP MARKING SPECIFICATION
7718W
022GB
1st line: Part number: 7718W means NCT7718W
2nd line: Assembly tracking code
0 22 : packages made in year 2010, week 22
G: Assembly house code
B: Product version
11. TAPING SPECIFICATION
- 20 -
Release Date: Feb., 2013
Version: 1.1
NCT7718W
12. PACKAGE DRAWING AND DIMENSIONS
MSOP-8L 3 X 3mm
Note:
1.
Mold Flash of Protrusion shall not exceed 0.25mm (0.010”)
- 21 -
Release Date: Feb., 2013
Version: 1.1
NCT7718W
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.
- 22 -
Release Date: Feb., 2013
Version: 1.1
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