MC34708 datasheet(78/159 Pages) FREESCALE

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Analog Integrated Circuit Device Data



Freescale Semiconductor

MC34708

Functional Block Description

7.6

Battery Management

BATTERY CHARGER NO LONGER SUPPORTED ON

MC34708.

7.7

Analog to Digital Converter

The ADC core is a 10-bit converter. The ADC core and logic run at an internally generated frequency of approximately 1.33 MHz.

The ADC is supplied from VCORE. The ADC core has an integrated auto calibration circuit which reduces the offset and gain

errors.

7.7.1

Input Selector

The ADC has 16 input channels. Table 67 gives an overview of the characteristics of each of these channels.

Some of the internal signals are first scaled to adapt the signal range to the input range of the ADC. The battery current is

indirectly read out by the voltage drop over the resistor in the charge path and battery path respectively. For details on scaling,

see Dedicated Readings.

Table 67. ADC Inputs

Channel

Signal read

Input Level

Scaling

Scaled Version

Battery Voltage (BATTISNSN)

0 – 4.8 V

0 – 2.4 V

Battery Current (BATTISNSN-BATTISNSP)

-80 mV – +80 mV (59)

x15

-1.2 to +1.2 V

Application Supply (BPSNS)

0 to 4.8 V

0 – 2.4 V

Die temperature

-40 – 150 °C

1.2 – 2.4 V

Reserved

USB Voltage (VBUS)

0 – 6.0 V

x0.4

0 – 2.4 V

Reserved

Coincell Voltage

0 – 3.6 V

X2/3

0 – 2.4 V

ADIN9 (60)

0 – 2.4 V

ADIN10 (60)

0 – 2.4 V

ADIN11 (60)

0 – 2.4 V

ADIN12/TSX1 (61)

0 – 2.4 V

x1/x2

0 – 2.4 V

ADIN13/TSX2 (61)

0 – 2.4 V

x1/x2

0 – 2.4 V

ADIN14/TSY1 (61)

0 – 2.4 V

x1/x2

0 – 2.4 V

ADIN15/TSY2 (61)

0 – 2.4 V

x1/x2

0 – 2.4 V

Notes

59.

Equivalent to -4.0 A to +4.0 A of current with a 20 mOhm sense resistor.

60.

Input must not exceed the BP voltage.

61.

Input must not exceed BO or VCORE.

MC34708 Datasheet(PDF) 78 Page - Freescale Semiconductor, Inc

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