Datasheet
164
RM57L843
SPNS215C –FEBRUARY 2014–REVISED JUNE 2016
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Peripheral Information and Electrical Specifications Copyright © 2014–2016, Texas Instruments Incorporated
7.4 12-bit Multibuffered Analog-to-Digital Converter (MibADC)
The MibADC has a separate power bus for its analog circuitry that enhances the Analog-to-Digital (A-to-D)
performance by preventing digital switching noise on the logic circuitry which could be present on V
SS
and
V
CC
from coupling into the A-to-D analog stage. All A-to-D specifications are given with respect to
AD
REFLO
, unless otherwise noted.
Table 7-15. MibADC Overview
DESCRIPTION VALUE
Resolution 12 bits
Monotonic Assured
Output conversion code 00h to FFFh [00 for V
AI
≤ AD
REFLO
; FFF for V
AI
≥ AD
REFHI
]
7.4.1 MibADC Features
• 10-/12-bit resolution
• AD
REFHI
and AD
REFLO
pins (high and low reference voltages)
• Total Sample/Hold/Convert time: 600 ns Typical Minimum at 30 MHz ADCLK
• One memory region per conversion group is available (Event Group, Group 1, and Group 2)
• Allocation of channels to conversion groups is completely programmable
• Memory regions are serviced either by interrupt or by DMA
• Programmable interrupt threshold counter is available for each group
• Programmable magnitude threshold interrupt for each group for any one channel
• Option to read either 8-, 10-, or 12-bit values from memory regions
• Single or continuous conversion modes
• Embedded self-test
• Embedded calibration logic
• Enhanced power-down mode
– Optional feature to automatically power down ADC core when no conversion is in progress
• External event pin (ADEVT) programmable as general-purpose I/O
7.4.2 Event Trigger Options
The ADC module supports three conversion groups: Event Group, Group1, and Group2. Each of these
three groups can be configured to be triggered by a hardware event. In that case, the application can
select from among eight event sources to be the trigger for a group's conversions.
7.4.2.1 MibADC1 Event Trigger Hookup
Table 7-16 lists the event sources that can trigger the conversions for the MibADC1 groups.