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EM78815H

8 Bit Microcontroller

ELAN Microelectronics 

EM78815

8-Bit Microcontroller

7.11 Differential Energy Detector (DED)

EGIN1

EGIN2

DED

DEDD

DEDPWR DEDTHD EGCLK

Fig.29 DED Block Diagram

The Differential Energy Detector is differential input level and zero crossing detector

named as DED. It can detect any incoming AC signal above its threshold level and

outputs a corresponding zero-crossing frequency pulse. For this energy detector,

user can set its minimum detection threshold level at –35dBm or –45dBm through the

DEDTHD bit. All the minimum detection value can be achieved under an input

capacitor of more than 4700 pF and input resistor of 100 kΩ. The energy detector

can be power-controlled by IOCE Page 1 Bit 1 (DEDPWR).

Register bits of the Energy Detector :

Register Bits

RF Page 0 Bit 3 (DED)

IOCE Page 1 Bit 7 (DEDD)

IOCE Page 1

Bit 5 (EDGE)

IOCE Page 1

Bit 4 (WUEDD)

IOCE Page 1

Bit 6 (DED)

IOCE Page 1

Bit 0 (DEDTHD)

IOCE Page 1

Bit 1 (DEDPWR)

IOCE Page 1

Bit 2 (DEDCLK)

Descriptions

DED : Interrupt flag of DED output data

DEDD : Output data of DED

EDGE : edge control of DED output data

1/0 → Falling edge trig. / Rising edge and Falling edge trig.

WUEDD : Wake-up control of DED output data

1/0 → enable/disable

DED : Interrupt mask of DED output data

1/0 → enable/disable interrupt of DED output data

DEDTHD : Minimum detection threshold of DED

0/1 → -45dBm/-30dBm

DEDPWR : Power control of DED

0/1 → power off/power on

DEDCLK : operating clock of DED

0 : low frequency clock

1 : high frequency clock

Product Specification (V2.4) 08.01.2004

65

(This specification is subject to change without further notice)

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