Micrel
MICRF405
April 2006
37
M9999-041906
(408) 955-1690
LDO_by LDO_EN1 LDO_EN0 Comments
X
0
0
LDOs turned off, power applied to AVDD, DVDD, RFVDD, min/max is 2.0/2.5 V, and
to VDD pin 11 and 1, min/max is 2.0/3.6V.
1
X
X
LDOs bypassed, power applied to the VDD pin1 and VDD pin11, min/max is 2.0/2.5 V
0
0
1
PA LDO turned on, power applied to VDD pin1 and 11, min/max is 2.0/3.6V, and to
AVDD and DVDD, min/max is 2.0/2.5V
0
1
0
PA and AVDD LDO turned on, power applied to the VDD pin1 and 11, min/max is
2.0/3.6V, and to DVDD, min/max is 2.0/2.5V
0
1
1
PA, AVDD and DIG LDO turned on, power applied to the VDD pin1 and VDD pin 11,
min/max is 2.0/3.6V
Table 30. Low DropOut Voltage Regulator.
PA_LDc_en Comments
0
PA is only controlled by Mode1 and Mode and PA0-2, PA on in transmit mode (Mode[1:0]=3 and PA[2:0]>0)
1
In transmit mode, PA is turned on by Lock Detect (LD=1 -> PA on). PA is turned off by load pulse or when
using openloop modulation and setting the DATAIN pin in tri-state. PA will be turned on again once LD goes
high again. LD_en must be set to 1.
Table 31. Lock Detect Controlled PA.
MOD_LDc_en Comments
0
Modulation starts once frame length is written into data byte.
1
Modulation starts once frame length is written into data byte and PA is turned on and LD is high.
Table 32. Lock Detect Controlled Start of Modulation (only for BIT_IO_en=0).
PA_FEc_en Comments
0
PA is turned off by Mode1 and Mode0 or PA0-2 and PA_LDc_en=0
1
PA is turned off immediately after the frame is transmitted.
Table 33. Frameend Controlled PA.
LD_en
State
Comments
0
LD off
Output is 0 volt, or test signals specified by OUTS[2:0]
1
LD on
LD pin high indicate that the PLL is locked
Table 34. Lock Detector.
SyncID_Len1 SyncID_Len0
Comments
0
0
SyncID length is 1 byte. SyncID0 is sent
0
1
SyncID length is 2 bytes. SyncID0 and SyncID1 is sent
1
0
SyncID length is 3 bytes. SyncID0, SyncID1 and SyncID2 is sent
1
1
SyncID length is 4 bytes. SyncID0, SyncID1, SyncID2 and SyncID3 is sent.
Table 35. SyncID Field Length.
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