34708 datasheet(81/159 Pages) FREESCALE

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Analog Integrated Circuit Device Data



Freescale Semiconductor

MC34708

Functional Block Description

Figure 19. Input Configuration with Battery Current Sense

7.7.3.3

Channel 2 Application Supply

The application supply voltage is read at the BP pin on channel 2. The battery voltage is first scaled as V(BP)/2 to fit the input

range of the ADC.

7.7.3.4

Channel 3 Die Temperature

The relation between the read out code and temperature is given in Table 73.

The Actual Die Temperature is obtained as follows: Die Temp = 25 + 0.426 * (ADC Code - 680)

7.7.3.5

Channel 4 Reserved

Channel 4 is reserved.

7.7.3.6

Channel 5 VBUS Voltage

The VBUS voltage is measured at the VBUS pin on channel 5. The VBUS voltage is first scaled in order to fit the input range of

the ADC by multiplying by 0.4.

7.7.3.7

Channel 6 and 7 Reserved

Channel 6 is reserved.

Table 72. Application Supply Voltage Reading Coding

Conversion Code

ADRESULTx[9:0]

Voltage at Input ADC in V

Voltage at BP in V

1 111 111 111

2.400

4.800

1 000 010 101

1.250

2.500

0 000 000 000

0.000

Table 73. Die Temperature Voltage Reading

Parameter

Min

Typ

Max

Unit

Die Temperature Read Out Code at 25 °C

680

Decimal

Slope temperature change per LSB

+0.426

°C/LSB

Slope error

5.0

20m

10u

Input/Battery

Monitoring

Battery

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