ADE1201 datasheet(20/40 Pages) AD

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ADE1201

Data Sheet

Rev. 0 | Page 20 of 40

COMPARATOR

OUTPUT

DEBOUNCE

FILTER

COUNTER

DEBOUNCE FILTER

OUTPUT

DEBOUNCE FILTER

COUNTER

UP/DOWN MODE

UP/CLEAR MODE

DEBOUNCE FILTER

OUTPUT

TIME

FILTER LENGTH

TIME

Figure 29. Debounce Filter Function Example

INVALID MODE

The register protection feature must be disabled when

configuring the ADE1201 (see the Protecting the Integrity of

Configuration Registers section). During this time, the state of

the DOUT1 pin does not reflect the state of the inputs on the

IN1 pin, and the IC is in invalid mode. The IC remains in this

mode until the register protection is enabled.

During invalid mode, the ADE1201 output on the DOUT1 pin

is set based on Bits[5:4] (INVALID_MODE) and Bit 3

(FORCEVAL) of the BIN_CTRL register.

If the INVALID_MODE bits are equal to 00, the DOUT1 filter

output is set to the value configured in the FORCEVAL bit in

the BIN_CTRL register. If the bits are equal to 01, the DOUT1

filter output is set to the DOUT1 output from the digital

datapath. If the bits are equal to 10, the DOUT1 filter output

toggles the value the bits had upon entering invalid mode. If the

bits are equal to 11, the DOUT1 filter output holds the current

value.

PROGRAMMABLE LOAD CURRENT

The ADE1201 programmable load current block diagram is

shown in Figure 30. The input impedance of the programmable

load is given in Table 1. When the programmable load is disabled

with the PL_EN register, Bit 15 and Bit 14 = 00, and the external

FET is conducting, the load sinks ~100 µA.

ADE1201

29kΩ

LOAD1

GNDF

Figure 30. Programmable Load Current Block Diagram

A high voltage digital input is presented to the ADE1201

application circuit, as shown in Figure 20. When the digital

input switches on to a high voltage state, the ADE1201 injects a

pulsed current load for a user defined period of time based on

the PL_HIGH_TIME register, and then switches to a constant

current. The pulsed current is sometimes called a wetting current

and removes oxidation from the digital input contacts, as well as

minimizes the effects of surge and electrical fast transients.

To calculate the value to write to the HIGH_CODE bits

(Bits[9:0]) of the PL_HIGH_CODE register to configure the

pulsed current, use the following equation:

HIGH_CODE = Pulsed Current/0.2

(2)

where Pulsed Current is the desired current level expressed in

mA. The resolution of the pulsed current is 0.2 mA per LSB.

The maximum current is (210 − 1) × 0.2 = 204.6 mA.

The recommended range of the pulsed current is between 20 mA

and 200 mA, and HIGH_CODE = 100 decimal to 1023 decimal.

The minimum current is 0.2 mA and HIGH_CODE = 1.

The pulsed current is applied for a time period set in Bits[11:0]

(HIGH_TIME) in the PL_HIGH_TIME register.

To determine the value to write to the HIGH_TIME bit field

based on the desired period of the pulse, use the following

equation:

HIGH_TIME = Pulsed Current Period/10

(3)

where Pulsed Current Period is the desired time period

expressed in µs. The resolution of the pulsed current period is

10 µs. The maximum period is (212 − 1) × 10 (µs) = 40.95 ms.

After the pulsed current period, the programmable load

switches to a constant current level set in the LOW_CODE bits

(PL_LOW_CODE register, Bits[5:0]). To determine the value to

write to the LOW_CODE bit field, use the following equation:

LOW_CODE = Constant Current/0.1

(4)

where:

Constant Current is the desired current level expressed in mA.

The resolution of the constant current is 0.1 mA per LSB.

The maximum current that can be set is (26 − 1) × 0.1 = 6.3 mA.

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