CS5461A datasheet(17/44 Pages) CIRRUS

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CS5461A

DS661F2

is (MCLK/K)/16. The pulse duration (tdur) is an integer

multiple of MCLK cycles, approximately equal to:

The maximum pulse duration (tdur) is determined by the

sampling rate and the minimum is defined by the maxi-

mum pulse frequency. The tdur limits are:

The Pulse Width Register (PW) does not affect the nor-

mal format.

5.4.2 Alternate Pulse Format

Setting bits MECH = 1 and STEP = 0 in the Control

figures the E1 and E2 pins for alternating pulse format

output (see Figure 4). Each pin produces alternating ac-

tive-low pulses with a pulse duration (tPW) defined by

the Pulse Width Register (PW):

MCLK = 4.096 MHz,

K = 1,

and

PW = 1

then

tPW = 0.25 ms. To ensure that pulses occur on the E1

and E2 output pins when full-scale input signals are ap-

plied to the voltage and current channels, then:

The pulse frequency (FREQE) is determined by the

PulseRateE1,2 Register and can be calculated using the

transfer function. The energy direction is not defined in

the alternate pulse format.

5.4.3 Mechanical Counter Format

Setting bits MECH = 1 and STEP = 0 in the Control

enables E1 and E2 for mechanical counters and similar

discrete counting instruments. When energy is nega-

tive, pulses appear on E2 (see Figure 5). When energy

is positive, the pulses appear on E1. The pulse width is

defined by the Pulsewidth Register and will limit the out-

put pulse frequency (FREQE). By default, PW = 512

samples,

MCLK = 4.096 MHz

and

K = 1

then

tPW = 128 ms. To ensure that pulses will occur, the

PulseRateE1,2 Register must be set to an appropriate

value.

5.4.4 Stepper Motor Format

Setting bits STEP = 1 and MECH = 0 in the Control

configures the E1 and E2 pins for stepper motor format.

When the accumulated active power equals the defined

dur

sec

()

PulseRateE

--------------------------------------------

≅

(MCLK/K)/16

-----------------------------------

dur

sec

()

(MCLK/K)/1024

-----------------------------------------

Figure 4. Alternate Pulse Format on E1 and E2

...

FREQ

()

(MCLK/K)/1024

-----------------------------------------

PulseRateE

------------

Positive Energy

Negative Energy

...

FREQ

Figure 5. Mechanical Counter Format on E1 and E2

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