Table 9-6. ADC Divider Ratios (continued)
CHANNEL # SIGNAL TYPE AUTO-SEQUENCED DIVIDER RATIO BUFFERED
20 LDO_3V3 Voltage No 3 No
21 I2C_ADDR Voltage No 3 Yes
22 GPIO0 Voltage No 3 Yes
23 GPIO1 Voltage No 3 Yes
24 GPIO2 Voltage No 3 Yes
25 GPIO3 Voltage No 3 Yes
26 GPIO4 Voltage No 3 Yes
27 GPIO5 Voltage No 3 Yes
28 GPIO6 Voltage No 3 Yes
29 GPIO7 Voltage No 3 Yes
30 GPIO8 Voltage No 3 Yes
31 BUSPOWERZ Voltage No 3 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 8-2 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
8-3 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 9-7 lists the I/O buffer types and descriptions. Table 9-8 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.
www.ti.com
TPS65982
SLVSD02E – MARCH 2015 – REVISED AUGUST 2021
Copyright © 2021 Texas Instruments Incorporated
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