TMS320VC5505 datasheet(29/136 Pages) TI2

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TMS320VC5505

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SPRS503B – JUNE 2009 – REVISED JANUARY 2010

Table 3-17. 10-Bit SAR ADC Terminal Functions

SIGNAL

TYPE(1)

OTHER(2) (3)

DESCRIPTION

NAME

NO.

SAR ADC

GPAIN0: General -Purpose Output and Analog Input pin 0. This pin is demuxed

internally into ADC Channels 0, 1, & 2. GPAIN0 can also be used as a

general-purpose open-drain output. This pin is unique among the GPAIN pins in that

it is the only pin that is 3.6 V-tolerant to support measuring a battery voltage.

GPAIN0

D10

I/O

VDDA_ANA

GPAIN0 can accommodate input voltages from 0 V to 3.6 V; although, the ADC is

unable to accept signals greater than VDDA_ANA without clamping. ADC Channel 1 is

capable of switching in an internal resistor divider that has a divide ratio of

approximately 1/8.

GPAIN1: General -Purpose Output and Analog Input pin 1. This pin is connected to

ADC Channel 3. GPAIN1 can be used as a general-purpose output if certain

requirements are met (see Note: below). GPAIN1 can accommodate input voltages

from 0 V to VDDA_ANA.

Note: If the ANA_LDO is used to supply power to VDDA_ANA, this pin must not be

GPAIN1

A11

I/O

VDDA_ANA

used as a general-purpose output (driving high) since the max current capability

(see the ISD parameter in Section 5.3, Electrical Characteristics Over Recommended

Ranges of Supply Voltage and Operating Temperature) of the ANA_LDO can be

exceeded. Doing so may result in the on-chip power-on reset (POR) resetting the

chip.

GPAIN2: General -Purpose Output and Analog Input pin 2. This pin is connected to

ADC Channel 4. GPAIN2 can be used as a general-purpose output if certain

requirements are met (see Note: below). GPAIN2 can accommodate input voltages

from 0 V to VDDA_ANA.

GPAIN2

B11

I/O

VDDA_ANA

Note: If the ANA_LDO is used to supply power to VDDA_ANA, this pin must not be

used as a general-purpose output (driving high) since the max current capability

(see the ISD parameter in Section 5.3, Electrical Characteristics Over Recommended

Ranges of Supply Voltage and Operating Temperature) of the ANA_LDO can be

exceeded. Doing so may result in the on-chip POR resetting the chip.

GPAIN3: General -Purpose Output and Analog Input pin 3. This pin is connected to

ADC Channel 5. GPAIN3 can be used as a general-purpose output if certain

requirements are met (see Note: below). GPAIN3 can accommodate input voltages

from 0 V to VDDA_ANA.

GPAIN3

C11

I/O

VDDA_ANA

Note: If the ANA_LDO is used to supply power to VDDA_ANA, this pin must not be

used as a general-purpose output (driving high) since the max current capability

(see the ISD parameter in Section 5.3, Electrical Characteristics Over Recommended

Ranges of Supply Voltage and Operating Temperature) of the ANA_LDO can be

exceeded. Doing so may result in the on-chip POR resetting the chip.

(1)

I = Input, O = Output, Z = High impedance, S = Supply voltage, GND = Ground, A = Analog signal

(2)

IPD = Internal pulldown, IPU = Internal pullup. For more detailed information on pullup/pulldown resistors and situations where external

pullup/pulldown resistors are required, see Section 4.8.1 , Pullup/Pulldown Resistors.

(3)

Specifies the operating I/O supply voltage for each signal

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