M
Features
TC52
General Description
The TC52 consists of two independent low power
voltage detectors in a space-saving 5-pin SOT-23A
package. Typical supply current consumption is only
2µA at an input voltage of 2V. The voltage detection
threshold settings are factory-programmed and
guaranteed to ±2% accuracy. Threshold settings over a
range of 1.5V to 5.0V are available. The TC52 is
available with open drain (NMOS) configurations.
Small size, high precision, low supply current, and low
installed cost makes the TC52 the ideal voltage
detector for a wide variety of voltage monitoring
applications.
Dual Channel Voltage Detector
• Two Independent Voltage Detectors in One
Package
• Highly Accurate: ±2%
• Low Power Consumption: 2.0µA, Typ.
• Detect Voltage Range: 1.5V to 5.0V
• Operating Voltage: 1.5V to 10.0V
• Output Configuration: N-Channel Open-Drain
• Space-Saving 5-Pin SOT-23A Package
Typical Applications
• Battery Life Monitors and Recharge Voltage
Monitors
• Memory Battery Backup Circuitry
• Power-On Reset Circuits
• Power Failure Detection
• Delay Circuitry
Functional Block Diagram
V
IN1
+
–
V
OUT1
Device Selection Table
Part Number
TC52-xxxxxxxxxx
Package
Temp. Range
V
IN2
5-Pin SOT-23A -40°C to +85°C
+
–
V
OUT2
Other output voltages are available. Please contact Microchip
Technology Inc. for details.
GND
Package Type
V
REF
5-Pin SOT-23A
V
OUT2
5
V
IN2
4
TC52
1
V
OUT1
2
V
IN1
3
GND
2002 Microchip Technology Inc.
DS21430B-page 1
TC52
1.0
ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Input Voltage ........................................................+12V
Output Current ....................................................50mA
Output Voltage.......................V
IN
+ 0.3V to V
SS
– 0.3V
Power Dissipation
5-Pin SOT-23A ...........................................100mW
Operating Temperature Range.............-40°C to +85°C
Storage Temperature Range ..............-40°C to +125°C
*Stresses above those listed under "Absolute Maximum
Ratings" may cause permanent damage to the device. These
are stress ratings only and functional operation of the device
at these or any other conditions above those indicated in the
operation sections of the specifications is not implied.
Exposure to Absolute Maximum Rating conditions for
extended periods may affect device reliability.
TC52 ELECTRICAL SPECIFICATIONS
Electrical Characteristics:
T
A
= 25°C, unless otherwise specified. Note 1.
Symbol
V
IN
I
SS
Parameter
Operating Voltage
Supply Current
Min
1.5
—
—
—
—
—
—
—
—
—
—
V
T1
x 0.98
V
T2
x 0.98
Typ
—
1.35
1.50
1.95
2.40
3.00
0.45
0.50
0.65
0.80
1.00
V
T1
±0.5%
V
T2
±0.5%
Max
10.0
3.90
4.50
5.10
5.70
6.30
1.30
1.50
1.70
1.90
2.10
V
T1
x 1.02
V
T2
x 1.02
Units
V
µ
A
Test Conditions
V
DF
(T) = 1.5 to 5.0V
V
IN1
= 1.5V
V
IN1
= 2.0V
V
IN1
= 3.0V
V
IN1
= 4.0V
V
IN1
= 5.0V
V
IN1
= 1.5V
V
IN1
= 2.0V
V
IN1
= 3.0V
V
IN1
= 4.0V
V
IN1
= 5.0V
Note 2
Note 2
I
IN2
Input Current V
IN2
µ
A
V
DET1
-
V
DET2
-
V
HYS1
V
HYS2
I
OUT
Channel 1 Detect Voltage
Channel 2 Detect Voltage
Hysteresis Range 1
Hysteresis Range 2
Output Current
V
V
V
V
mA
V
DET1
- x 0.02 V
DET1
- x 0.05 V
DET1
- x 0.08
V
DET2
- x 0.02 V
DET2
- x 0.05 V
DET2
- x 0.08
0.3
3.0
5.0
6.0
7.0
—
—
2.2
7.7
10.1
11.5
13.0
±100
—
—
—
—
—
—
—
0.2
V
OL
= 0.5V, V
IN1
= 1.0V
V
IN1
= 2.0V
V
IN1
= 3.0V
V
IN1
= 4.0V
V
IN1
= 5.0V
∆
V
DET
-/
(
∆
T
OPR
V
DET
-)
Temperature Characteristics
Detection Time
ppm/°C -40°C
≤
T
OPR
≤
85°C
msec
Time from V
IN
= V
DET
- to
V
OUT
= V
OL
t
DLY
Note
1:
2:
Additional resistance between the V
IN1
pin and the supply voltage may alter the electrical characteristics.
V
T1
, V
T2
are the factory-programmed voltage detection thresholds.
DS21430B-page 2
2002 Microchip Technology Inc.
TC52
2.0
PIN DESCRIPTIONS
The descriptions of the pins are listed in Table 2-1.
TABLE 2-1:
Pin No.
(5-Pin SOT-23A)
1
2
3
4
5
PIN FUNCTION TABLE
Symbol
V
OUT1
V
IN
GND
V
IN2
V
OUT2
Detector #1 output.
Supply voltage input, detect voltage 1.
Ground terminal.
Detect voltage 2.
Detector #2 output.
Description
3.0
DETAILED DESCRIPTION
In normal steady-state operation and for either
channel, when V
IN
> V
DET
-, the output is high, see
Figure 3-1. (In the case of the TC52N, this is an open-
drain condition.) If and when the input falls below
V
DET
-, the output pulls down (Logic 0) to V
SS
.
Generally, V
OUT
can pull down to within 0.5V of V
SS
at
rated output current and input voltages. (Also see
Section 1.0, Electrical Characteristics).
The output, V
OUT
, stays valid until the input voltage falls
below the minimum operating voltage, V
IN
MIN
, of 0.7V.
Below this minimum operating voltage, the output is
undefined. During power-up or anytime V
IN
has fallen
below V
IN
MIN
, V
OUT
will remain undefined until V
IN
rises
above V
IN
MIN
, at which time the output becomes valid.
V
OUT
is maintained in its active low state while V
IN
MIN
<
V
IN
< V
DET
+. (V
DET
+ = V
DET
- + V
HYST
). If and when
the input rises above V
DET
+, the output will assume its
inactive state (open-drain for TC52N).
FIGURE 3-1:
TIMING DIAGRAM
V
INx
V
DET
+
V
HYST
Detect Voltage V
DET
–
Minimum Operating
Voltage
Ground Level
Release Voltage
or RESET Voltage
V
OUTx
Output Voltage
Ground Level
2002 Microchip Technology Inc.
DS21430B-page 3
TC52
4.0
APPLICATIONS INFORMATION
4.1
Battery and Main Supply Monitor
Pin 2 (V
IN1
) acts as both the input to Voltage Detector
#1, as well as the power supply input for the chip. As
such, always assign V
IN1
to monitor voltages between
1.5V and 10V. Failure to do this will result in unreliable
detector operation due to an out-of-tolerance supply
voltage. In high noise environments, it may be
necessary to install a small input bypass capacitor
(0.01µF to 0.1µF) from V
IN1
to ground to minimize on-
chip power supply noise.
The circuit shown in Figure 4-1 provides both a
processor supply monitor/reset function, as well as a
low battery detect function. As shown, the
TC52N3330ECT (N-Channel outputs) uses Detector 2
to monitor the system power supply rail. When the
power supply is 10% below its nominal output voltage
rating, the V
OUT2
output is driven and held low. When
the power supply voltage is above 3.0V nominal, V
OUT2
is driven to an open circuit and the combination of R
1
and C
1
provides a reset time out delay. Detector 1
monitors the voltage on the main supply battery. A low
battery condition is indicated when the battery voltage
falls to 3.3V, at which time the main processor is
interrupted to initiate a warning or system shutdown.
FIGURE 4-1:
SUPPLY MONITOR AND PROCESSOR SUPERVISOR
+3.3V
System
3.3V
R
1
47K
V
OUT2
RESET
TC105
Step Down
DC/DC
Converter
6V
Battery
V
IN2
+
–
+C
1
– 1µF
+3.3V
R
2
47K
GND
TC52N3330ECT
V
IN1
V
OUT1
Processor
INT
DS21430B-page 4
2002 Microchip Technology Inc.
TC52
5.0
5.1
PACKAGING INFORMATION
Package Marking Information
3
1
represents N-channel indication and integer part
of output voltage
Symbol
C
N
Output
CMOS
Nch
2
3
represents registration serial number
Detect Voltage 1 Detect Voltage 2
4.5
2.7
Symbol
0P
Note:
Symbols for other custom voltages set prior to shipment.
4
represents assembly lot code
5.2
Taping Form
Component Taping Orientation for 5-Pin SOT-23A (EIAJ SC-74A) Devices
User Direction of Feed
Device
Marking
W
PIN 1
P
Standard Reel Component Orientation
TR Suffix Device
(Mark Right Side Up)
Carrier Tape, Number of Components Per Reel and Reel Size
Package
Carrier Width (W)
Pitch (P)
Part Per Full Reel
Reel Size
5-Pin SOT-23A
8 mm
4 mm
3000
7 in
2002 Microchip Technology Inc.
DS21430B-page 5
嵌入式系统
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