Texas Instruments CC2500 User Manual

CC2500
S
WRS040
C
Page
78
of
89
0x1F: WOREVT0
–
Low
Byte Event0 Timeout
Bit
Field Name
Reset
R/W
Description
7:0
EVENT0[7:0]
107 (0x6B)
R/W
Low byte of Event 0 timeout register.
The default Event 0 value gives 1.0
s timeout, as
suming a
26.0 MHz crystal.
0x20: WORCTRL
–
Wake On Radio
C
ontrol
Bit
Field Name
Reset
R/W
Description
7
RC_PD
1
R/W
Power down signal to RC oscillator. When written to 0, automatic
initial calibration will be performed
6:4
EVENT1[2:0]
7 (111)
R/W
Time
out setting from register block. Decoded to Event 1 timeout.
RC oscillator clock frequency equals F
XOSC
/750, which is 34.7
-
36
kHz, depending on crystal frequency. The table below lists the
number of clock periods after Event 0 before Event 1 times out.
Set
ting
t_event1
0 (000)
4 (0.111
–
0.115 ms)
1 (001)
6 (0.167
–
0.173 ms)
2 (010)
8 (0.222
–
0.230 ms)
3 (011)
12 (0.333
–
0.346 ms)
4 (100)
16 (0.444
–
0.462 ms)
5 (101)
24 (0.667
–
0.692 ms)
6 (110)
32 (0.889
–
0.923 ms)
7 (111)
48 (1.333
–
1.385 m
s)
3
RC_CAL
1
R/W
Enables (1) or disables (0) the RC oscillator calibration.
2
Reserved
R0
1:0
WOR_RES
[1:0]
0 (00)
R/W
Controls the Event 0 resolution
as well as
maximum timeout of the
WOR module
and maximum timeout under normal RX operation
:
Settin
g
Resolution (1 LSB)
Max timeout
0 (00)
1 period (28
–
29 μs)
1.8
–
1.9 seconds
1 (01)
2
5
periods (0.89
–
0.92 ms)
58
–
61 seconds
2 (10)
2
10
periods (28
–
30 ms)
31
–
32 minutes
3 (11)
2
15
periods (0.91
–
0.94 s)
16.5
–
17.2 hours
Note that
WOR_RES
s
hould be 0 or 1 when using WOR
because
WOR_RES > 1
will give a very low duty cycle.
In normal RX operation all settings of
WOR_RES
can be used.
0x21: FREND1
–
Front
E
nd RX
C
onfiguration
Bit
Field Name
Reset
R/W
Description
7:6
LNA_CURRENT[1:0]
1 (01)
R
/W
Adjusts front
-
end LNA PTAT current output
5:4
LNA2MIX_CURRENT[1:0]
1 (01)
R/W
Adjusts front
-
end PTAT outputs
3:2
LODIV_BUF_CURRENT_RX[1:0]
1 (01)
R/W
Adjusts current in RX LO buffer (LO input to mixer)
1:0
MIX_CURRENT[1:0]
2 (10)
R/W
Adjusts current
in mixer

Texas Instruments CC2500 Specifications

General

Brand	Texas Instruments
Model	CC2500
Category	Transceiver
Language	English