EM78815
8-Bit Microcontroller
7.11 Differential Energy Detector (DED)
EGIN1
DEDD
DED
EGIN2
EGCLK
DEDPWR DEDTHD
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
Descriptions
DED : Interrupt flag of DED output data
DEDD : Output data of DED
RF Page 0 Bit 3 (DED)
IOCE Page 1 Bit 7 (DEDD)
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
IOCE Page 1
Bit 5 (EDGE)
IOCE Page 1
Bit 4 (WUEDD)
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
IOCE Page 1
Bit 6 (DED)
IOCE Page 1
Bit 0 (DEDTHD)
DEDPWR : Power control of DED
IOCE Page 1
Bit 1 (DEDPWR)
0/1 → power off/power on
DEDCLK : operating clock of DED
0 : low frequency clock
1 : high frequency clock
IOCE Page 1
Bit 2 (DEDCLK)
Product Specification (V2.4) 08.01.2004
(This specification is subject to change without further notice)
65
ELAN [ ELAN MICROELECTRONICS CORP ]
