TPS65982ABZBHR datasheet(64/121 Pages) TI1

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TPS65982

SLVSD02D – MARCH 2015 – REVISED JUNE 2019

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Table 6. ADC Divider Ratios (continued)

CHANNEL #

SIGNAL

TYPE

AUTO-SEQUENCED

DIVIDER RATIO

BUFFERED

GPIO0

Voltage

Yes

GPIO1

Voltage

Yes

GPIO2

Voltage

Yes

GPIO3

Voltage

Yes

GPIO4

Voltage

Yes

GPIO5

Voltage

Yes

GPIO6

Voltage

Yes

GPIO7

Voltage

Yes

GPIO8

Voltage

Yes

BUSPOWERZ

Voltage

Yes

9.3.17.2 ADC Operating Modes

The ADC is configured into one of three modes: single channel readout, round robin automatic readout and one

time automatic readout.

9.3.17.3 Single Channel Readout

In Single Channel Readout mode, the ADC reads a single channel only. Once the channel is selected by

firmware, a conversion takes place followed by an interrupt back to the digital core. Figure 5 shows the timing

diagram for a conversion starting with an ADC enable. When the ADC is disabled and then enabled, there is an

enable time T_ADC_EN (programmable) before sampling occurs. Sampling of the input signal then occurs for

time T_SAMPLE (programmable) and the conversion process takes time T_CONVERT (12 clock cycles). After

time T_CONVERT, the output data is available for read and an Interrupt is sent to the digital core for time

T_INTA (2 clock cycles).

In Single Channel Readout mode, the ADC can be configured to continuously convert that channel. Figure 6

shows the ADC repeated conversion process. In this case, once the interrupt time has passed after a conversion,

a new sample and conversion occurs.

9.3.17.4 Round Robin Automatic Readout

When this mode is enabled, the ADC state machine will read from channel 0 to channel 11 and place the

converted data into registers. The host interface can request to read from the registers at any time. During

Round Robin Automatic Readout, the channel averaging must be set to 1 sample.

When the TPS65982 is running a Round Robin Readout, it will take approximately 696 μs (11 channels × 63.33

μs conversion) to fully convert all channels. Since the conversion is continuous, when a channel is converted, it

will overwrite the previous result. Therefore, when all channels are read, any given value may be 649 μs out of

sync with any other value.

9.3.17.5 One Time Automatic Readout

The One Time Automatic Readout mode is identical to the Round Robin Automatic Readout except the

conversion process halts after the final channel is converted. Once all 11 channels are converted, an interrupt

occurs to the digital core.

9.3.18 I/O Buffers

Table 7 lists the I/O buffer types and descriptions. Table 8 lists the pin to I/O buffer mapping for cross-referencing

a pin’s particular I/O structure. The following sections show a simplified version of the architecture of each I/O

buffer type.

Table 7. I/O Buffer Type Description

BUFFER TYPE

DESCRIPTION

IOBUF_GPIOHSSWD

General Purpose High-Speed I/O

IOBUF_GPIOHSSPI

General Purpose High-Speed I/O

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