EVAL-ADE7953EBZ【PDF 44/72 页】BOARD EVAL FOR ADE7953

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ADE7953

A zero-crossing event on any of the three input channels can be

configured to trigger an external interrupt. All zero-crossing

external interrupts are disabled by default. The voltage channel

zero-crossing interrupt is enabled by setting the ZXV bit (Bit 15)

in the IRQENA register (Address 0x22C and Address 0x32C). If

this bit is set, a voltage channel zero-crossing event causes the IRQ

pin to go low. The Current Channel A zero-crossing interrupt is

enabled by setting the ZXIA bit (Bit 12) in the IRQENA register

(Address 0x22C and Address 0x32C). If this bit is set, a Current

Channel A zero-crossing event causes the IRQ pin to go low. The

Current Channel B zero-crossing interrupt is enabled by setting

the ZXIB bit (Bit 12) in the IRQENB register (Address 0x22F

and Address 0x32F). If this bit is set, a Current Channel B zero-

crossing event causes the IRQ pin to go low (see the ADE7953

Interrupts section).

ZERO-CROSSING TIMEOUT

The ADE7953 includes a zero-crossing timeout feature that is

designed to detect when no zero crossings are obtained over a

programmable time period. This feature is available on both

current channels and the voltage channel and can be used to

detect when the input signal has dropped out. The duration of

the zero-crossing timeout is programmed in the 16-bit ZXTOUT

register (Address 0x100). The same timeout duration is used for

all three channels. The value in the ZXTOUT register is decre-

mented by 1 LSB every 14 kHz (CLKIN/256). If a zero crossing

is obtained, the ZXTOUT register is reloaded. If the ZXTOUT

register reaches 0, a zero-crossing timeout event is issued. The

ZXTOUT register has a resolution of 0.07 ms (1/14 kHz); there-

fore, the maximum programmable timeout period is 4.58 seconds.

As shown in Figure 64, a zero-crossing event causes one of the

zero-crossing timeout bits—ZXTO, ZXTO_IA, or ZXTO_IB—

to be set to 1. The ZXTO and ZXTO_IA bits are located in the

IRQSTATA register (Address 0x22D and Address 0x32D) and

are set when a zero-crossing timeout event occurs on the voltage

channel or on Current Channel A, respectively. The ZXTO_IB

bit is located in the IRQSTATB register (Address 0x230 and

Address 0x330) and is set when a zero-crossing timeout event

Data Sheet

ZXTOUT

ADDRESS 0x100

INPUT

SIGNAL

ZXTO_x

Figure 64. Zero-Crossing Timeout

Three interrupts are associated with the zero-crossing timeout

feature. If enabled, a zero-crossing timeout event causes the

external IRQ pin to go low. The interrupt associated with the

voltage channel zero-crossing timeout can be enabled by setting

the ZXTO bit (Bit 14) of the IRQENA register (Address 0x22C

and Address 0x32C). The Current Channel A interrupt can be

enabled by setting the ZXTO_IA bit (Bit 11) of the IRQENA

register (Address 0x22C and Address 0x32C), and the Current

Channel B interrupt can be enabled by setting the ZXTO_IB bit

(Bit 11) of the IRQENB register (Address 0x22F and Address

0x32F). All three interrupts are disabled by default (see the

ADE7953 Interrupts section).

ZERO-CROSSING THRESHOLD

To prevent spurious zero crossings when a very small input is

present, an internal threshold is included on all channels of the

ADE7953 . This fixed threshold is set to a range of 1250:1 of the

input full scale. If any input signal falls below this level, no zero-

crossing signals are produced by the ADE7953 because they can

be assumed to be noise. This threshold affects both the external

zero-crossing pins, ZX (Pin 1) and ZX_I (Pin 21), as well as the

zero-crossing interrupt function. At inputs of lower than 1250:1

of the full scale, the zero-crossing timeout signal continues to

function and issues an event according to the time duration

programmed in the ZXTOUT register (Address 0x100).

occurs on Current Channel B.

Rev. B | Page 44 of 72

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