900844 datasheet(93/118 Pages) FREESCALE

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Analog Integrated Circuit Device Data

Freescale Semiconductor

900844

FUNCTIONAL DEVICE OPERATION

ADC SUBSYSTEM

CURRENT SENSING

The load current sourced by a select set of regulators can be measured and recorded by the ADC on channels 1 through 5.

Table 61 shows a summary of these regulators, type, and their current ranges.

INPUT VOLTAGE

The input voltage is read at the VBAT pin at channel 6. The input voltage is first scaled by subtracting 2.40 V in order to fit the

input range of the ADC.

GENERAL PURPOSE ANALOG INPUTS

There are twelve general purpose analog input channels that can be measured through the ADIN10-ADIN21 pins. Two voltage

scaling (gain) settings can be selected to accommodate a wider range of inputs through the ADCCNTL3 and ADCCNTL4

registers. A gain of 0 sets a corresponding scaling factor of 1 (for an input range of 2.0 V) and a gain of 1 sets a corresponding

scaling factor of 10 (for an input range of 200 mV).

Table 60. PMIC Die Temperature Voltage Reading

Parameter

Typical

Die Temperature Read Out Code at 25 °C

1011000001

Temperature change per LSB

+0.4244 °C

Customer Defined LSB Value

1.0000 °C

Multiplier Value for Output Register

x2.36

Table 61. Regulators Current Sensing

Regulator

Type

Current Range

VCC

Buck

0 – 3.5 A

VNN

Buck

0 – 1.6 A

VCC180

LDO

0 – 0.39 A

Table 62. Battery Voltage Reading Coding

Conversion Code

Voltage at ADC input

Voltage at VBAT

1 111 111 111

2.400 V

4.800 V

1 000 010 100

1.250 V

2.500 V

0 000 000 000

0.000 V

Table 63. General Purpose Analog Inputs Reading Coding

Conversion Code

Voltage at ADC input Voltage at ADINx Input

GAIN

1 111 111 111

2.400

0.200

1 011 111 111

1.800

0.150

0 011 111 111

0.600

0.050

0 000 000 000

0.000

1 111 111 111

2.400

2.000

1 011 111 111

1.800

1.500

0 011 111 111

0.600

0.500

0 000 000 000

0.000

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