CC2500RGPR Datasheet, PDF (78/99 Pages) Texas Instruments – Low-Cost Low-Power 2.4 GHz RF Transceiver

Bit Field Name
7:0 EVENT0[7:0]
CC2500
0x1F: WOREVT0 – Low Byte Event0 Timeout
Reset
R/W Description
107 (0x6B) R/W
Low byte of Event 0 timeout register.
The default Event 0 value gives 1.0 s timeout, assuming a
26.0 MHz crystal.
Bit Field Name
7 RC_PD
6:4 EVENT1[2:0]
3 RC_CAL
2 Reserved
1:0 WOR_RES[1:0]
0x20: WORCTRL – Wake On Radio Control
Reset R/W Description
1
7 (111)
1
0 (00)
R/W Power down signal to RC oscillator. When written to 0, automatic
initial calibration will be performed
R/W Timeout setting from register block. Decoded to Event 1 timeout.
RC oscillator clock frequency equals FXOSC/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.
Setting 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 ms)
R/W Enables (1) or disables (0) the RC oscillator calibration.
R0
R/W Controls the Event 0 resolution as well as maximum timeout of the
WOR module and maximum timeout under normal RX operation:
Setting Resolution (1 LSB)
Max timeout
0 (00)
1 (01)
2 (10)
3 (11)
1 period (28 – 29 μs)
2⁵ periods (0.89 – 0.92 ms)
2¹⁰ periods (28 – 30 ms)
2¹⁵ periods (0.91 – 0.94 s)
1.8 – 1.9 seconds
58 – 61 seconds
31 – 32 minutes
16.5 – 17.2 hours
Note that WOR_RES should 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 End RX Configuration
Bit Field Name
Reset R/W Description
7:6 LNA_CURRENT[1:0]
1 (01)
5:4 LNA2MIX_CURRENT[1:0]
1 (01)
3:2 LODIV_BUF_CURRENT_RX[1:0] 1 (01)
1:0 MIX_CURRENT[1:0]
2 (10)
R/W Adjusts front-end LNA PTAT current output
R/W Adjusts front-end PTAT outputs
R/W Adjusts current in RX LO buffer (LO input to mixer)
R/W Adjusts current in mixer
SWRS040C
Page 78 of 89