68HC705SB7 datasheet(97/170 Pages) FREESCALE

97 / 170 page

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

°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

TSEN

LVRON

SCLK

CSSEL

TCSEL

ESVEN

SMINLEV

$000B

COPON

reset:

01000000

Figure 14-1. Miscellaneous Control Register (MCR)

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