NCT7717U
Nuvoton
Thermal Sensor IC
Date: Sep./2020
Revision: 1.3
NCT7717U/-T
NCT7717U Datasheet Revision History
PAGES
DATES
VERSION
MAIN CONTENTS
1
05/25/09
0.2
Preliminary version.
2
10/29/09
0.3
The ALERT# point hardware power-on setting table
and register detail is TBD.
3
12/25/09
0.4
Modified the registers default value and the hardware
strapping resistor value.
4
05/06/10
0.5
Modified the hardware strapping resistor value.
5
09/15/10
1.0
Add the top marking specification, key specification and
AC/DC specification
All versions before 1.0 are preliminary versions
6
12/23/10
1.1
Add taping specification
7
9
1/11/11
1.11
Modified the Alert mod setting register description,
correct some typo
8
13
11/29/17
1.2
Add NCT7717U-T for new package type
9
6
09/29/20
20
1.3
Update strapping resistor information
-I-
Release Date: Sep., 2020
Version: 1.3
NCT7717U/-T
Table of Content1.
GENERAL DESCRIPTION ............................................................................................................................ 1
2.
FEATURES ................................................................................................................................................. 1
2.1
2.2
2.3
MONITORING ITEMS – TEMPERATURE .............................................................................................................. 1
GENERAL..................................................................................................................................................... 1
PACKAGE..................................................................................................................................................... 1
3.
KEY SPECIFICATIONS ................................................................................................................................. 1
4.
PIN CONFIGURATION ............................................................................................................................... 2
5.
PIN DESCRIPTION ..................................................................................................................................... 2
6.
FUNCTION DESCRIPTION .......................................................................................................................... 3
6.1
6.2
6.3
6.4
6.5
6.6
7.
GENERAL DESCRIPTION .................................................................................................................................. 3
ACCESS INTERFACE ........................................................................................................................................ 3
ADDRESS SETTING ......................................................................................................................................... 3
TEMPERATURE MEASUREMENT DATA FORMAT .................................................................................................. 5
ALERT# OUTPUT ......................................................................................................................................... 5
ALERT# POINT HARDWARE POWER-ON SETTING................................................................................................. 7
REGISTER SUMMARY ................................................................................................................................ 7
7.1
7.2
8.
REGISTER MAP ............................................................................................................................................. 7
REGISTER DETAIL .......................................................................................................................................... 8
ELECTRICAL CHARACTERISTICS ............................................................................................................... 13
8.1
8.2
8.3
9.
ABSOLUTE MAXIMUM RATINGS..................................................................................................................... 13
DC CHARACTERISTICS .................................................................................................................................. 13
AC CHARACTERISTICS .................................................................................................................................. 14
ORDER INSTRUCTION ............................................................................................................................. 15
10.
TOP MARKING SPECIFICATION............................................................................................................ 15
11.
TAPING SPECIFICATION ...................................................................................................................... 15
12.
PACKAGE DRAWING AND DIMENSIONS ............................................................................................. 16
12.1
12.2
SOT-23 (5L) 1.6X2.9 MM^2 .................................................................................................................... 16
TSOT-23 (5L) 1.6X2.9 MM2, THICKNESS 0.8MM(MAX) ................................................................................. 17
- II -
Release Date: Sep., 2020
Version: 1.3
NCT7717U/-T
1. GENERAL DESCRIPTION
NCT7717U is an one on-chip local thermal sensor with high accuracy, a 8-bit ADC (Analog-to-Digital
Converter) is built inside NCT7717U to convert the monitored temperature value with 1C resolution.
The NCT7717U supports an independent over temperature protection signal to activate system
protection and hardware thermal shutdown via the ALERT# pin.
The NCT7717U is a high precision, low-power consumption IC supporting SMBus TM interface, which
is specifically designed for the PC, Notebook applications, and any embedded environments. Its
available package is 5-pin SOT23/TSOT23, with the working voltage of 3.3V.
2. FEATURES
2.1
Monitoring Items – Temperature
2.2
General
2.3
One on-chip thermal sensor
Measure temperature with high accuracy
Two’s complement data format, 1C resolution
Alert point supports Hardware Power-on Setting
I2C® Compatible System Management bus (SMBusTM)
3.3V±5% VDD operation
Package
SOT-23-5/TSOT23-5 Lead Free (ROHS Compliant) and Halogen Free Package
3. KEY SPECIFICATIONS
PARAMETER
RATING
-40C to +125C (TA)
Local temperature range and accuracy
Typ. 2C (20C~40C)
Max. 3C (-40C~125C) *1
Supply voltage
3.3V ± 5%
Operating supply current
700 uA typ.
ADC resolution include sign bit
8 Bits
*1 Guaranteed by design from -40~125 degreeC.
-1-
Release Date: Sep., 2020
Version: 1.3
NCT7717U/-T
4. PIN CONFIGURATION
5. PIN DESCRIPTION
PIN TYPE
OD12
INts
P
PIN ATTRIBUTE
Open-drain output pin with 12 mA sink capability
TTL level input pin and chmitt trigger
Power or Ground Pin
PIN NO.
PIN NAME
I/O
1
SCL
INts
2
GND
P
3
ALERT#
OD12
4
VDD
P
5
SDA
INts/ OD12
FUNCTION
SMBus TM Clock
Power supply ground
Alarm output, for interrupt control or shutdown
control
DC Power supply, Voltage input 3.3V±10%
SMBus TM bi-directional data
-2-
Release Date: Sep., 2020
Version: 1.3
NCT7717U/-T
6. FUNCTION DESCRIPTION
6.1
General Description
NCT7717U is SMBusTM interface device to provide on-die temperature sensor, 1 wire alert signal for
event notification or system shutdown.
6.2
Access Interface
NCT7717U provides SMBusTM to access the internal register, 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
6.3
Address Setting
-3-
Release Date: Sep., 2020
Version: 1.3
NCT7717U/-T
NCT7717U I2C/ SMBusTM address is 1001000xb (x is R/W bit).
-4-
Release Date: Sep., 2020
Version: 1.3
NCT7717U/-T
6.4
Temperature Measurement Data Format
The local temperature (on-die) data with 8-bit 2`s complement format.
6.5
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
ALERT# Output
The NCT7717U 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
-5-
Release Date: Sep., 2020
Version: 1.3
NCT7717U/-T
6.5.2
ALERT# Output Interrupt Mode
Figure 2 shows the mechanism of the ALERT# output interrupt mode. In this mode, the NCT7717U
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 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
6.5.3
ALERT# Output SMBusTM alert Mode
Figure 3 shows the mechanism of the ALERT# output SMBusTM alert mode. In this mode, the ALERT#
output of the NCT7717U 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 NCT7717U 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-
Release Date: Sep., 2020
Version: 1.3
NCT7717U/-T
6.6
ALERT# point hardware power-on setting
The default value could be set after power up 100ms by different pull-up resistor of ALERT# pin:
Note: Please use 1% precision resistor.
TEMPERATURE (℃)
PULL-UP RESISTOR
2KΩ
75
90
100
105
110
7.5KΩ
ALERT
10.5KΩ
14KΩ
18.7KΩ
7. REGISTER SUMMARY
7.1
Register Map
Idx Register Name Attr
Dft
7
6
5
4
3
2
0 LDT Readout
RO
00
2 Alert Status
RO
00
ADC_Busy
STS_LTHA
3 Configuration [R]
RW
21
ALERT_MSK
STOP_Mnt
RW
08
5 Temp [R]
RW
-
9 Configuration [W]
RW
21
RW
08
RW
-
WO
FF
RW
00
CustomerLogReg1[7:0]
RW
00
CustomerLogReg2[7:0]
2F Log Register 3
RW
00
CustomerLogReg3[7:0]
BF Alert mode
RW
01
FD CID (Chip ID)
RO
50
50h
FE VID (Vendor ID)
RO
50
50h
FF DID (Device ID)
RO
90
90H
Conversion Rate
4 [R]
LT High Alert
Conversion Rate
A [W]
LT High Alert
B Temp [W]
One Shot
F Conversion
Customer Data
2D Log Register 1
Customer Data
2E Log Register 2
Customer Data
1
0
MNTREG_LT[7:0]
Reserved
Reserved
Reserved
EN_FaultQueue
ConvRate[3:0]
LT_HAT[7:0]
ALERT_MSK
STOP_Mnt
Reserved
Reserved
EN_FaultQueue
ConvRate[3:0]
LT_HAT[7:0]
Reserved
-7-
Alert_MD
Release Date: Sep., 2020
Version: 1.3
NCT7717U/-T
7.2
Register Detail
7.2.1
Register：Local Diode Temperature Readout
Location : Address 00h
Type : Read Only
Power on default value : 00
BIT
7
5
4
3
2
1
0
Local Diode Temperature Readout Value. The real temperature value calculation is
referred to TEMPERATURE MEASUREMENT DATA FORMAT.
NAME
SIGN
VALUE
7.2.2
6
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
NAME
ADC_Busy
STS_LTHA
DEFAULT
0
0
4
3
2
1
0
Reserved
BIT
FLAG NAME
7
ADC_Busy
If set to ‘1’ indicates ADC is busy converting.
6
STS_LTHA
If set to ‘1’ indicates a measured Local Diode Temperature Higher than
Local High set point (High Limit).
7.2.3
DESCRIPTION
Register：Configuration
Location : Read = Address 03h
Write = Address 09h
Type : Read/Write
Power on default value : 21
BIT
7
6
NAME
ALERT_MSK
STOP_Mnt
DEFAULT
0
0
BIT
7
5
4
3
Reserved
2
1
0
EN_FaultQueue
1
DESCRIPTION
ALERT_MSK – ALERT# function is enable
0 = Enable
-8-
Release Date: Sep., 2020
Version: 1.3
NCT7717U/-T
BIT
DESCRIPTION
1 = Disable
STOP_Mnt – Stop Monitor and entry Standby
6
0 = Monitor
1 = Stop Monitor
EN_FaultQueue–Enable Fault Queue function.
0 = Disable. ALERT# will be generated if monitor result of any channel is above or below
high/low set point.
0
1 = Enable. ALERT# will be generated if monitor result of any channel is three successive
times above or below high/low set point.
7.2.4
Register：Conversion Rate
Location : Read = Address 04h
Write = Address 0Ah
Type : Read/Write
Power on default value : 08
BIT
7
6
5
NAME
Reserved
DEFAULT
Reserved
4
3
2
1
0
ConvRate
1
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
-9-
0
Release Date: Sep., 2020
Version: 1.3
NCT7717U/-T
7.2.5
Register：Local Diode Temperature Alert Temperature
Location : Read = Address 05h
Write = Address 0Bh
Type : Read/Write
Power on default value : Hardware strapping.
BIT
7
6
5
4
NAME
2
1
0
4
2
1
LDT Alert Temperature
VALUE
SIGN
64
32
16
DEFAULT
7.2.6
3
8
Hardware strapping
Register：One Shot Conversion
Location : Address 0Fh
Type : Write Only
BIT
DESCRIPTION
7-0
One Shot Conversion – When enter Stop Monitor state, to fill any value into this register
will trigger one temperature conversion cycle.
7.2.7
Register：Customer Data Log Registers
Location : Address 2Dh, 2Eh, 2Fh
Type : Read/Write
Power on default value : 00
BIT
7
6
5
4
3
2
NAME
Customer Data Log Register
DEFAULT
00h
7.2.8
1
0
Register：Alert Mode Setting
Location : Address BFh
Type : Read/Write
Power on default value : 01
BIT
NAME
7
6
5
4
3
Reserved
1
0
ALERT_MD
DEFAULT
01h
BIT
DESCRIPTION
0
2
ALERT_MD – ALERT mode configuration
0 = Interrupt or SMBus TM alert mode ,
1 = Comparator mode
- 10 -
Release Date: Sep., 2020
Version: 1.3
NCT7717U/-T
* Note: To enable Interrupt or SMBus
same time.
TM
alert mode, the address[21h] must be written 0x00 at the
- 11 -
Release Date: Sep., 2020
Version: 1.3
NCT7717U/-T
Register：Chip ID
Location : Address FDh
Type : Read Only
Power on default value : 50
BIT
7-0
7.2.9
DESCRIPTION
Chip ID.
Chip ID of NCT7717U is 50h
Register：Vendor ID
Location : Address Feh
Type : Read Only
Power on default value : 50
BIT
7-0
DESCRIPTION
Vendor ID.
Vendor ID of NCT7717U is 50h
7.2.10 Register：Device ID
Location : Address FFh
Type : Read Only
Power on default value: 9x
BIT
7-0
DESCRIPTION
Device ID.
Device ID of NCT7717U is 9xh (x=0,1,2…)
- 12 -
Release Date: Sep., 2020
Version: 1.3
NCT7717U/-T
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
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
INts -
VOL
IOL = 12 mA
0.4
V
0.8
V
VDD = 3.3V
V
VDD = 3.3V
TTL level Schmitt-triggered input pin
Input Low Voltage
VIL
Input High Voltage
VIH
Input High Leakage
ILIH
+10
A
VIN=3.3V
Input Low Leakage
ILIL
-10
A
VIN=0V
2.0
- 13 -
Release Date: Sep., 2020
Version: 1.3
NCT7717U/-T
8.3
AC Characteristics
SMBus TM Interface
PARAMETER
SYMBOL
MIN.
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
SCL clock period
- 14 -
MAX.
UNIT
Release Date: Sep., 2020
Version: 1.3
NCT7717U/-T
9. ORDER INSTRUCTION
PART NO.
NCT7717U
NCT7717U-T
PACKAGE
SUPPLIED AS
SOT-23, 5pin
T Shape:
Green Package
3,000 units/T&R
TSOT23, 5pin
T Shape:
Green Package
3,000 units/T&R
PRODUCTION FLOW
Commercial, 0℃ to +70℃
Commercial, 0℃ to +70℃
10. TOP MARKING SPECIFICATION
7717U
7717T
1st Line : 7717U means part number NCT7717U
7717T means part number NCT7717U-T
11. TAPING SPECIFICATION
- 15 -
Release Date: Sep., 2020
Version: 1.3
NCT7717U/-T
12. PACKAGE DRAWING AND DIMENSIONS
12.1 SOT-23 (5L) 1.6X2.9 MM^2
D
e1
HE
E
b
e
Y
L
L1
- 16 -
Release Date: Sep., 2020
Version: 1.3
NCT7717U/-T
12.2 TSOT-23 (5L) 1.6X2.9 mm2, Thickness 0.8mm(Max)
- 17 -
Release Date: Sep., 2020
Version: 1.3
NCT7717U/-T
Important Notice
Nuvoton products are not designed, intended, authorized or warranted for use as components
in systems or equipment intended for surgical implantation, atomic energy control
instruments, airplane or spaceship instruments, transportation instruments, traffic signal
instruments, combustion control instruments, or for other applications intended to support or
sustain life. Furthermore, Nuvoton products are not intended for applications wherein failure of
Nuvoton products could result or lead to a situation wherein personal injury, death or severe
property or environmental damage could occur.
Nuvoton customers using or selling these products for use in such applications do so at their
own risk and agree to fully indemnify Nuvoton for any damages resulting from such improper
use or sales.
- 18 -
Release Date: Sep., 2020
Version: 1.3
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