CS5467-IS Просмотр технического описания (PDF) - Cirrus Logic

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CS5467-IS

Four-channel Power / Energy IC

Cirrus Logic 

CS5467

E3MODE[1:0] in the Modes register when E1MODE is

not enabled.

E3MODE1 E3MODE0

0

0

0

1

1

0

1

1

E3 output

Total Reactive Energy

Power Fail Monitor

Voltage1 Sign

Total Apparent Energy

Table 5. E3 Pin Configuration

When both E2MODE bits are high, the E1MODE bits

are enabled, allowing active, apparent, reactive, or wide

band reactive energy for both energy channels to be

output on E1 and E2. Table 6 lists the functions of E1

and E2 with E1MODE enabled.

E1MODE1 E1MODE0

E1 / E2 outputs

0

0

Active Energy

0

1

Apparent Energy

1

0

Reactive Energy

1

1

Wideband Reactive

Table 6. E1 / E2 Modes

When E1MODE bits are enabled, the E3 pin outputs ei-

ther the power fail monitor status, or the sign of the E1

and E2 outputs. Table 7 list the functions of the E3 pin

using E3MODE[1:0] in the Modes register when

E1MODE is enabled .

E3MODE1 E3MODE0

E3 output

0

0

Power Fail Monitor

0

1

Energy Sign

1

0

not used

1

1

not used

Table 7. E3 Pin with E1MODE enabled

6.8 No Load Threshold

The No Load Threshold register (LoadMIN) is used to

zero out the contents of EPULSE and QPULSE registers if

their magnitude is less than the LoadMIN register value.

6.9 Energy Pulse Width

Note: Energy Pulse Width (PulseWidth) only applies to

E1, E2, or E3 pins that are configured to output pulses.

When any are configured to output steady-state signals,

such as voltage1 sign, power fail monitor, or energy

sign, pulse widths and output rates do not apply.

The pulse width time (tpw) in Figure 2, is set by the value

in the PulseWidth register which is an integer multiple of

the sample or output word rate (OWR). At OWR of

4000 Hz (a period of 250 uS) tpw = PulseWidth x

250 uS. By default, PulseWidth is set to 1.

6.10 Energy Pulse Rate

The full-scale pulse frequency of enabled E1, E2, E3

pins is the value in PulseRate x output word rate

(OWR)/2. The actual pulse frequency is the full-scale

pulse frequency multiplied by the pulse register’s

(EPULSE, SPULSE, or QPULSE) value.

Example:

If the output word rate (OWR) is 4000 Hz, and the

PulseRate register is set to 0.05, the full-rate pulse fre-

quency is 0.05 x 4000 / 2 = 100 Hz. If the EPULSE regis-

ter, driving E1, is 0.4567, the pulse output rate on E1 will

be 100 Hz x 0.4567 = 45.67 Hz.

6.11 Voltage Sag/Current Fault Detection

Voltage sag detection is used to determine when aver-

aged voltage falls below a predetermined level for a

specified interval of time. Current fault detection deter-

mines when averaged current falls below a predeter-

mined level for a specified interval of time.

The specified interval of time (duration) is set by the val-

ue in the V1SagDUR (V2SagDUR) and I1FaultDUR

(I2FaultDUR) registers. Setting any of these to zero (de-

fault) disables the detect feature for the given channel.

The value is in output word rate (OWR) samples. The

predetermined level is set by the values in the

V1SagLEVEL (V2SagLEVEL) and I1FaultLEVEL

(I2FaultLEVEL) registers.

DS714F1

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