PIC10F322T-I/OT Microchip Technology, PIC10F322T-I/OT Datasheet - Page 89

• Manufacturer Part Number: PIC10F322T-I/OT
• Description: 896 B Flash, 64 B RAM, 4 I/O, 8bit ADC, PWM, CLC, DDS, CWG, TEMP Indicator, 2.3V
• Manufacturer: Microchip Technology

Specifications of PIC10F322T-I/OT

• Core: RISC
• Processor Series: PIC10F
• Data Bus Width: 8 bit
• Maximum Clock Frequency: 31 KHz
• Program Memory Size: 512 B
• Data Ram Size: 64 B
• Number Of Programmable I/os: 4
• Number Of Timers: 2
• Operating Temperature Range: - 40 C to + 85 C
• Package / Case: SOT-23-6
• Mounting Style: SMD/SMT
• Maximum Operating Temperature: + 85 C
• Program Memory Type: Flash
• Lead Free Status / Rohs Status: Details

14.0
This family of devices is equipped with a temperature
circuit designed to measure the operating temperature
of the silicon die. The circuit’s range of operating
temperature falls between of -40°C and +85°C. The
output is a voltage that is proportional to the device
temperature. The output of the temperature indicator is
internally connected to the device ADC.
The circuit may be used as a temperature threshold
detector or a more accurate temperature indicator,
depending on the level of calibration performed. A one-
point calibration allows the circuit to indicate a
temperature closely surrounding that point. A two-point
calibration allows the circuit to sense the entire range
of temperature more accurately. Reference Application
Note AN1333, “Use and Calibration of the Internal
Temperature Indicator” (DS01333) for more details
regarding the calibration process.
14.1
Figure 14-1
temperature circuit. The proportional voltage output is
achieved by measuring the forward voltage drop across
multiple silicon junctions.
Equation 14-1
the temperature indicator.
EQUATION 14-1:
The temperature sense circuit is integrated with the
Fixed
Section 12.0 “Fixed Voltage Reference (FVR)”
more information.
The circuit is enabled by setting the TSEN bit of the
FVRCON register. When disabled, the circuit draws no
current.
The circuit operates in either high or low range. The high
range, selected by setting the TSRNG bit of the
FVRCON register, provides a wider output voltage. This
provides more resolution over the temperature range,
but may be less consistent from part to part. This range
requires a higher bias voltage to operate and thus, a
higher V
The low range is selected by clearing the TSRNG bit of
the FVRCON0 register. The low range generates a
lower voltage drop and thus, a lower bias voltage is
needed to operate the circuit. The low range is provided
for low voltage operation.
 2011 Microchip Technology Inc.
Voltage
DD
High Range: V
Low Range: V
TEMPERATURE INDICATOR
MODULE
Circuit Operation
is needed.
shows a simplified block diagram of the
describes the output characteristics of
Reference
OUT
OUT
V
OUT
= V
= V
RANGES
DD
DD
(FVR)
- 2V
- 4V
T
T
module.
See
Preliminary
for
FIGURE 14-1:
14.2
When the temperature circuit is operated in low range,
the device may be operated at any operating voltage
that is within specifications.
When the temperature circuit is operated in high range,
the device operating voltage, V
enough to ensure that the temperature circuit is cor-
rectly biased.
Table 14-1
range setting.
TABLE 14-1:
14.3
The output of the circuit is measured using the internal
Analog-to-Digital Converter. A channel is reserved for
the temperature circuit output. Refer to
“Analog-to-Digital Converter (ADC) Module”
detailed information.
14.4
To ensure accurate temperature measurements, the
user must wait at least 200 s after the ADC input
multiplexer is connected to the temperature indicator
output before the conversion is performed. In addition,
the user must wait 200 s between sequential
conversions of the temperature indicator output.
Min. V
PIC10(L)F320/322
Minimum Operating V
Minimum Sensing Temperature
DD
Temperature Output
ADC Acquisition Time
shows the recommended minimum V
3.6V
, TSRNG = 1
V
RECOMMENDED V
RANGE
DD
TEMPERATURE CIRCUIT
DIAGRAM
V
OUT
TSEN
Min. V
TSRNG
DD
DD
DS41585A-page 89
To ADC
, must be high
DD
1.8V
, TSRNG = 0
DD
Section 15.0
vs.
VS.
DD
vs.
for