423
SAM4CP [DATASHEET]
43051E–ATPL–08/14
27.5
Signal Description
Table 27-2.
Signal Description
Signal Name
Function
Type
VIMA
Negative Differential Voltage Input
Input
VIPA
Positive Differential Voltage Input
Input
VRP
Internal Reference “Plus” Voltage. Connect an external
decoupling capacitor between VRP and VRM (1nF - 100nF)
Output
VRM
Internal Reference “Minus” Voltage. Connect an external
decoupling capacitor between VRP and VRM (1nF - 100nF)
Output
VRC
Common-mode Voltage. Bypass to analog ground with an
external decoupling capacitor (100pF - 1nF)
Output
EMIT0 - EMIT11
PLC Transmission ports
Output
AGC0 - AGC5
PLC Automatic Gain Control:
These digital tri-state outputs are managed by ACG
hardware logic to drive external circuitry when input signal
attenuation is needed
Output
TXRX0 - TXRX1
PLC Ext. coupling TxRx control
Output
VZ CROSS
Mains Zero-Cross Detection Signal:
This input detects the zero-crossing of the mains voltage
Input
ARST
PLC Asynchronous Reset:
ARST is active low
Internal configuration: 33k
Ω
typ. pull up resistor
Input
SRST
PLC Synchronous Reset
SRST is active low
Internal configuration: 33k
Ω
typ. pull up resistor
Input
PLL INIT
PLL Initialization Signal
PLL INIT is active low
Internal configuration: 33k
Ω
typ. pull up resistor
Input
CLKEA
PLC External Clock Input
CLKEA must be connected to one terminal of a crystal
(when a crystal is being used) or used as input for
external clock signal
Input
CLKEB
PLC External Clock Input/Output
CLKEB must be connected to one terminal of a crystal
(when a crystal is being used) or must be floating when an
external clock signal is connected thru CLKEA
I/O
CLKOUT
10MHz External Clock Output
Output
VDDIO
PLC Digital pads 3.3V Power Supply
Power
VDDPLL PLC
PLC PLL Power Supply
Power
VDDIN PLC
PLC Digital Regulator input
Power
VDDOUT PLC
PLC Digital Regulator output
Power
VDDIN AN
PLC Analog Regulator input
Power
VDDOUT AN
PLC Analog Regulator output
Power
GND
Digital Ground
Power
AGND
Analog Ground
Power