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LTC1392CN8#PBF

P1-P3P4-P6P7-P9P10-P12
1
LTC1392
Micropower Temperature,
Power Supply and
Differential Voltage Monitor
1
2
3
4
8
7
6
5
V
CC
–V
IN
+V
IN
GND
D
IN
D
OUT
CLK
CS
LTC1392
LTC1392 • TA01
5V
+
R
SENSE
I
LOAD
1µF
MPU
(e.g., 68HC11)
P1.4
P1.3
P1.2
TEMPERATURE (°C)
–40
TEMPERATURE ERROR (°C)
5
4
3
2
1
0
–1
–2
–3
–4
–5
0
40
60
LTC1392 • TA02
–20
20
80
100
LTC1392C
GUARANTEED
LIMIT
LTC1392I
GUARANTEED
LIMIT
TYPICAL
D
U
ESCRIPTIO
S
F
EA
T
U
RE
■
Complete Ambient Temperature Sensor Onboard
■
System Power Supply Monitor
■
10-Bit Resolution Rail-to-Rail Common-Mode
Differential Voltage Input
■
Available in 8-Pin SO and PDIP
■
0.2µA Supply Current When Idle
■
700µA Supply Current When Sampling at
Maximum Rate
■
Single Supply Voltage: 4.5V to 6V
■
3-Wire Half-Duplex Serial I/O
■
Communicates with Most MPU Serial Ports and All
MPU Parallel I/O Ports
The LTC
®
1392 is a micropower data acquisition system
designed to measure temperature, on-chip supply voltage
and a differential voltage. The differential inputs feature
rail-to-rail common mode input voltage range. The LTC1392
contains a temperature sensor, a 10-bit A/D converter with
sample-and-hold, a high accuracy bandgap reference and
a 3-wire half-duplex serial interface.
The LTC1392 can be programmed to measure ambient
temperature, power supply voltage and an external volt-
age at the differential input pins, that can also be used for
current measurement using an external sense resistor.
When measuring temperature, the output code of the A/D
converter is linearly proportional to the temperature in °C.
Production trimming achieves ±2°C initial accuracy at
room temperature and ±4°C over the full –40°C to 85°C
temperature range.
The on-chip serial port allows efficient data transfer to a
wide range of MPUs over three or four wires. This,
coupled with low power consumption, makes remote
location sensing possible and facilitates transmitting
data through isolation barriers.
U
S
A
O
PP
L
IC
AT
I
■
Temperature Measurement
■
Power Supply Measurement
■
Current Measurement
■
Remote Data Acquisition
■
Environment Monitoring
, LTC and LT are registered trademarks of Linear Technology Corporation.
U
A
O
PP
L
IC
AT
ITY
P
I
CA
L
Complete Temperature, Supply Voltage and
Supply Current Monitor
Output Temperature Error
2
LTC1392
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
WU
U
PACKAGE
/
O
RDER I FOR ATIO
(Note 1)
Supply Voltage (V
CC
) ................................................ 7V
Input Voltage ................................. –0.3V to V
CC
+ 0.3V
Output Voltage............................... –0.3V to V
CC
+ 0.3V
Operating Temperature Range
LTC1392C............................................... 0°C to 70°C
LTC1392I........................................... –40°C to 85°C
Junction Temperature.......................................... 125°C
Storage Temperature Range ................ – 65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
ORDER PART
NUMBER
S8 PART MARKING
1392
1392I
Consult factory for Military grade parts.
(Note 2, 3)
E
LECTR
IC
AL C CHARA TERIST
ICS
LTC1392CN8
LTC1392CS8
LTC1392IN8
LTC1392IS8
T
JMAX
= 125°C,
θ
JA
= 100°C/W (N8)
T
JMAX
= 125°C,
θ
JA
= 130°C/W (S8)
1
2
3
4
8
7
6
5
TOP VIEW
D
IN
D
OUT
CLK
CS
V
CC
–V
IN
+V
IN
GND
S8 PACKAGE
8-LEAD PLASTIC SO
N8 PACKAGE
8-LEAD PDIP
PARAMETER CONDITIONS MIN TYP MAX UNITS
Power Supply To Digital Conversion
Resolution V
CC
= 4.5V to 6V 10 Bit
Total Absolute Error V
CC
= 4.5V to 6V ● ±8 LSB
Differential Voltage to Digital
Conversion (Full-Scale Input = 1V)
Resolution 10 Bit
Integral Linearity Error (Note 5) ● ±0.5 ±1 LSB
Differential Linearity Error ● ±0.5 ±1 LSB
Offset Error ● ±4 LSB
Full-Scale Error ● ±15 LSB
Differential Voltage to Digital
Conversion (Full-Scale Input = 0.5V)
Resolution 10 Bit
Integral Linearity Error (Note 5) ● ±0.5 ±2 LSB
Differential Linearity Error ● ±0.5 ±1 LSB
Offset Error ● ±8 LSB
Full-Scale Error ● ±25 LSB
Temperature to Digital Conversion
Accuracy T
A
= 25°C (Note 7) ±2 °C
T
A
= T
MAX
or T
MIN
(Note 7) ● ±4 °C
Nonlinearity T
MIN
≤ T
A
≤ T
MAX
(Note 4) ±1 °C
3
LTC1392
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
I
ON LEAKAGE
On-Channel Leakage Current (Note 6) ● ±1 µA
I
OFF LEAKAGE
Off-Channel Leakage Current (Note 6) ● ±1 µA
V
IH
High Level Input Voltage V
CC
= 5.25V ● 2V
V
IL
Low Level Input Voltage V
CC
= 4.75V ● 0.8 V
I
IH
High Level Input Current V
IN
= V
CC
● 5 µA
I
IL
Low Level Input Current V
IN
= 0V ● –5 µA
V
OH
High Level Output Voltage V
CC
= 4.75V, I
OUT
= 10µA ● 4.5 4.74 V
V
CC
= 4.75V, I
OUT
= 360µA 2.4 4.72 V
V
OL
Low Level Output Voltage V
CC
= 4.75V, I
OUT
= 1.6mA ● 0.4 V
I
OZ
Hi-Z Output Current CS = High ● ±5 µA
I
SOURCE
Output Source Current V
OUT
= 0V –25 mA
I
SINK
Output Sink Current V
OUT
= V
CC
45 mA
I
CC
Supply Current CS = High ● 0.1 5 µA
CS = Low, V
CC
= 5V ● 0.7 1 mA
t
SMPL
Analog Input Sample Time See Figure 1 1.5 CLK Cycles
t
CONV
Conversion Time See Figure 1 10 CLK Cycles
t
dDO
Delay Time, CLK↓ to D
OUT
Data Valid C
LOAD
= 100pF ● 150 300 ns
t
en
Delay Time, CLK↓ to D
OUT
Data Enabled C
LOAD
= 100pF ● 60 150 ns
t
dis
Delay Time, CS ↑ to D
OUT
Hi-Z ● 170 450 ns
t
hDO
Time Output Data Remains Valid After CLK↓ C
LOAD
= 100pF 30 ns
t
f
D
OUT
Fall Time C
LOAD
= 100pF ● 70 250 ns
t
r
D
OUT
Rise Time C
LOAD
= 100pF ● 25 100 ns
C
IN
Input Capacitance Analog Input On-Channel 30 pF
Analog Input Off-Channel 5 pF
Digital Input 5 pF
(Note 2, 3)
E
LECTR
IC
AL C CHARA TERIST
ICS
RECOM ENDED OPERATING CONDITIONS
UUU
U
WW
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CC
Supply Voltage 4.5 6 V
f
CLK
Clock Frequency V
CC
= 5V 150 250 350 kHz
t
CYC
Total Cycle Time f
CLK
= 250kHz 74 µs
Temperature Conversion Only 144 µs
t
hDI
Hold Time, D
IN
After CLK↑ V
CC
= 5V 150 ns
t
suCS
Setup Time CS↓ Before First CLK↑ (See Figure 1) V
CC
= 5V 2 µs
t
WAKEUP
Wakeup Time CS↓ Before Start Bit↑ (See Figure 1) V
CC
= 5V 10 µs
Temperature Conversion Only 80 µs
t
suDI
Setup Time, D
IN
Stable Before CLK↑ V
CC
= 5V 150 ns
t
WHCLK
Clock High Time V
CC
= 5V 1.6 µs
t
WLCLK
Clock Low Time V
CC
= 5V 2 µs
t
WHCS
CS High Time Between Data Transfer Cycles V
CC
= 5V, f
CLK
= 250kHz 2 µs
t
WLCS
CS Low Time During Data Transfer V
CC
= 5V, f
CLK
= 250kHz 72 µs
Temperature Conversion Only 142 µs
P1-P3P4-P6P7-P9P10-P12

LTC1392CN8#PBF

Mfr. #:
Buy LTC1392CN8#PBF
Manufacturer:
Analog Devices Inc.
Description:
Current & Power Monitors & Regulators Power Data Acquisition System
Lifecycle:
New from this manufacturer.
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