External Signal Description - STMicroelectronics SPC572L series Reference Manual

RM0400
from the external modulator. The external pin function control for these pins must be
configured in the integration logic on a device, and is not included in the SDADC digital
interface.
35.5

External signal description

Table 355
some of the digital and analog signals might share pins or may not be available external to
the chip.
Name
AN[0:7] SoC-specific
EMDATA SoC-specific
EMCLK SoC-specific
VREFP SoC-specific
VREFN SoC-specific
AVDD SoC-specific
AVSS SoC-specific
DVDD SoC-specific
DVSS SoC-specific
35.5.1 Detailed signal descriptions
Table 356
Signal I/O
Each analog input can be used as a single-ended analog input or one of a differential pair of analog
inputs which is connected to either positive or negative terminals of the SDADC, depending on the
mode of operation and polarity selection.
AN[0:7] I
State meaning Analog input
Data stream input provided by external modulator.
State meaning
EMDATA I
Sigma-Delta Analog-to-Digital Converter (SDADC) Digital Interface
shows the list of signals driven by external pins. At the chip integration level,
Table 355. Signal properties
Port
Single-ended analog inputs or Differential pairs
of analog inputs
External modulator data input
External modulator clock input
Voltage reference for SDADC
Ground reference for SDADC
Analog voltage supply for SDADC
Analog ground supply for SDADC
Digital voltage supply for SDADC
Digital ground supply for SDADC
provides a detailed description of the external signals.
Table 356. Detailed signal descriptions
Timing Can be sampled at any time by the ADC.
Asserted—Data input is 1
Negated—Data input is 0
Assertion—May occur at any time, but data stream is valid only when external
Timing modulator is selected by MCR[MODSEL] = 1.
Negation—Ignored when external modulator is not selected.
DocID027809 Rev 4
Function
Description
I/O Reset Pull-up
I — —
I 0 —
I 0 —
I — —
I — —
I — —
I — —
I — —
I — —
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