Datasheet

Data Sheet ADE7953
Rev. B | Page 49 of 72
ALTERNATIVE OUTPUT FUNCTIONS
The ADE7953 includes three output pins that are configured by
default to output power quality information.
• Pin 1 (ZX) provides a voltage channel zero-crossing signal,
as described in the Voltage Channel Zero Crossing section.
• Pin 21 (ZX_I) provides a current channel zero-crossing
signal, as described in the Current Channel Zero Crossing
section.
• Pin 20 (
REVP
) provides polarity information, as described
in the Reverse Power section.
To provide flexibility and to accommodate a variety of design
requirements, the ADE7953 can be configured to output a
variety of alternative power quality signals on any of these
three outputs. Alternative functions are configured using the
ALT_OUTPUT register (Address 0x110).
Table 8 summarizes the functions that can be output on Pin 1,
Pin 21, and Pin 20. Note that the default functions of ZX, ZX_I,
and
REVP
can be configured to output on any one of Pin 1,
Pin 21, or Pin 20.
As described in Table 8, the description of each function can be
found in the corresponding section of this data sheet. If an alter-
native output function is enabled on Pin 1, Pin 21, or Pin 20, the
function can be configured and will be performed as described
in the corresponding section. The alternative function will, how-
ever, appear as an unlatched output on Pin 1, Pin 21, or Pin 20.
To enable an alternative function, the ZX_ALT, ZXI_ALT, and
REVP_ALT bits in the ALT_OUTPUT register must be set. The
interrupt enable associated with the alternative output does not
need to be enabled in order for it to be present on Pin 1, Pin 21,
or Pin 20. Enabling an alternative output does not affect the
primary function of the feature.
Table 8. Alternative Outputs
Function See This Section
Zero-crossing detection
(voltage channel)
Voltage Channel Zero Crossing
Zero-crossing detection
(current channels)
Current Channel Zero Crossing
Reverse power indication Reverse Power
Voltage sag detection Voltage Sag Detection
Active energy no-load
detection (Current Channel A)
Active Energy No-Load
Detection
Active energy no-load
detection (Current Channel B)
Active Energy No-Load
Detection
Reactive energy no-load
detection (Current Channel A)
Reactive Energy No-Load
Detection
Reactive energy no-load
detection (Current Channel B)
Reactive Energy No-Load
Detection
Waveform sampling, data ready Instantaneous Powers and
Waveform Sampling
Interrupt output (Current
Channel B)
Current Channel B Interrupts