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68HC705SB7 Datasheet(PDF) 97 Page - Freescale Semiconductor, Inc

Part # 68HC705SB7
Description  SPECIFICATION (General Release)
PDF  170 Pages
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Manufacturer  FREESCALE [Freescale Semiconductor, Inc]
Direct Link  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

68HC705SB7 Datasheet(HTML) 97 Page - Freescale Semiconductor, Inc

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August 27, 1998
GENERAL RELEASE SPECIFICATION
MC68HC05SB7
TEMPERATURE SENSOR
MOTOROLA
REV 2.1
14-1
SECTION 14
TEMPERATURE SENSOR
The MC68HC05SB7 MCU can measure temperature in two ways: by using the
internal temperature sensor, or by using an external thermistor.
14.1
INTERNAL TEMPERATURE SENSOR
The internal temperature sensor is designed to measure temperature over the
0
°C to 70 °C range; with its voltage output connected to channel 5 of the Analog
Subsystem (AN5, see Analog Subsystem section).
The temperature sensor is disabled/enabled by the TSEN bit in the Miscellaneous
Control Register at $0B. The TSEN bit also disables/enables the BandGap
reference voltage.
TSEN — Internal Temperature Sensor and BandGap Reference Enable
This read/write bit enables the internal temperature sensor and BandGap refer-
ence. Reset clears TSEN.
1 =
Temperature sensor and bandgap reference enabled.
0 =
Temperature sensor and bandgap reference disabled.
NOTE
The temperature gradient is typically 2.2mV/
°C ±10%.
The internal temperature sensor is a semiconductor type sensor. Due to process
variations, the absolute output voltage at a given temperature will vary from one
device to another. It is the user’s responsibility to measure and calibrate the
temperature sensor output voltage when the MCU is in the target system.
As an option, the temperature sensor voltage at 80
°C is available preprogrammed
into the PEPROM. See PEPROM section.
BIT 7
BIT 6
BIT 5
BIT 4
BIT 3
BIT 2
BIT 1
BIT 0
MCR
R
TSEN
LVRON
0
SCLK
CSSEL
TCSEL
ESVEN
SMINLEV
$000B
W
COPON
reset:
01000000
Figure 14-1. Miscellaneous Control Register (MCR)



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