cyrf6936 Cypress Semiconductor Corporation., cyrf6936 Datasheet - Page 22

• Manufacturer Part Number: cyrf6936
• Description: Wirelessusb Lp 2.4 Ghz Radio Soc
• Manufacturer: Cypress Semiconductor Corporation.

Document #: 38-16015 Rev. *G
Mnemonic
Bit
Default
Read/Write
Function
Bits 7:4
Bits 3:0
Mnemonic
Bit
Default
Read/Write
Function
Bits 7:5
Bits 4:0
Mnemonic
Bit
Default
Read/Write
Function
A Received Signal Strength Indicator (RSSI) reading is taken automatically when an SOP symbol is detected. In addition, an RSSI reading is
taken whenever RSSI_ADR is read. The contents of this register are not valid after the device is configured for receive mode until either a SOP
symbol is detected, or the register is (re)read. The conversion can occur as often as once every 12 μs. The approximate slope of the curve is
1.9 dB/count, but is not guaranteed.
If it is desired to measure the background RF signal strength on a channel before a packet has been received then the MCU should perform
a “dummy” read of this register, the results of which should be discarded. This “dummy” read causes an RSSI measurement to be taken, and
therefore subsequent readings of the register yield valid data.
Bit 7
Bit 5
Bits 4:0
Not Used.
32 Chip Data PN Code Correlator Threshold. This register sets the correlator threshold used in DSSS modes when DATA
CODE LENGTH (see TX_CFG_ADR) is set to 32. Typical applications configure TH32 = 05h.
Not Used.
64 Chip Data PN Code Correlator Threshold. This register sets the correlator threshold used in DSSS modes when the DATA
CODE LENGTH (see TX_CFG_ADR) is set to 64. Typical applications configure TH64 = 0Eh.
SOP RSSI Reading. When set, this bit indicates that the reading in the RSSI field was taken when a SOP symbol was
detected. When cleared, this bit indicates that the reading stored in the RSSI field was triggered by a previous SPI read of this
register.
LNA State. This bit indicates the LNA state when the RSSI reading was taken. When cleared, this bit indicates that the LNA
was disabled when the RSSI reading was taken; if set this bit indicates that the LNA was enabled when the RSSI reading was
taken.
RSSI Reading. This field indicates the instantaneous strength of the RF signal being received at the time that the RSSI reading
was taken. A larger value indicates a stronger signal. The signal strength measured is for the RF signal on the configured chan-
nel, and is measured after the LNA stage.
Not Used
Not Used
SOP
R
7
7
7
0
-
-
-
-
Not Used
Not Used
Not Used
DATA32_THOLD_ADR
DATA64_THOLD_ADR
6
6
6
-
-
-
-
-
-
Not Used
Not Used
RSSI_ADR
LNA
R
5
5
5
1
-
-
-
-
Not Used
R/W
R
4
4
0
4
0
-
-
R/W
R/W
R
3
0
3
1
3
0
TH64
RSSI
R/W
R/W
R
2
1
2
0
2
0
TH32
Address
R/W
Address
R/W
Address
R
1
0
1
1
1
0
CYRF6936
Page 22 of 40
R/W
R/W
R
0
0
0
0
0
0
0x12
0x13
0x11
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