CYWUSB6935-28SEI Cypress Semiconductor Corp, CYWUSB6935-28SEI Datasheet - Page 20

• Manufacturer Part Number: CYWUSB6935-28SEI
• Description: IC WIRELESS USB 2.4GHZ 28-SOIC
• Manufacturer: Cypress Semiconductor Corp

Specifications of CYWUSB6935-28SEI

• Frequency: 2.4GHz
• Data Rate - Maximum: 62.5kbps
• Modulation Or Protocol: DSSS, GFSK
• Applications: AMR, ISM, RKE
• Power - Output: 0dBm
• Sensitivity: -95dBm
• Voltage - Supply: 2.7 V ~ 3.6 V
• Current - Receiving: 57.7mA
• Current - Transmitting: 69.1mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 28-SOIC
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Memory Size: -
• Other names: 428-1576-5

Document 38-16008 Rev. **
Bit
7
6
5:0 Crystal Adjust
Bit
7:6 VCO Slope Enable
5:0 Reserved
Reserved
Name
Reserved
Clock Output Disable The Clock Output Disable bit disables the 13 MHz clock driven on the X13OUT pin.
Name
(Write-Only)
7
7
VCO Slope Enable
Addr: 0x24
Addr: 0x26
Clock Output
Disable
6
6
Description
The Voltage Controlled Oscillator (VCO) Slope Enable bits are used to specify the amount of variance automat-
ically added to the VCO.
These bits are undefined for read operations.
These bits are reserved and should be written with zeros.
This bit is reserved and should be written with zero.
The Crystal Adjust value is used to calibrate the on-chip load capacitance supplied to the crystal. The Crystal
Description
If the 13 MHz clock is driven on the X13OUT pin then receive sensitivity will be reduced by -4 dBm on channels
5+13n. By default the 13 MHz clock output pin is enabled. This pin is useful for adjusting the 13 MHz clock, but
it interfere with every 13th channel beginning with 2.405GHz channel. Therefore, it is recommended that the 13
MHz clock output pin be disabled when not in use.
Adjust value will depend on the parameters of the crystal being used. Refer to the appropriate reference material
for information about choosing the optimum Crystal Adjust value.
11 = -5/+5 VCO adjust. The application MCU must configure this option during initialization.
10 = -2/+3 VCO adjust.
01 = Reserved.
00 = No VCO adjust.
1 = No 13 MHz clock driven externa
0 = 13 MHz clock driven externally
5
5
Figure 7-28. VCO Calibration
Figure 7-27. Crystal Adjust
PRELIMINARY
REG_CRYSTAL_ADJ
4
REG_VCO_CAL
4
.
ll
y
.
3
3
Crystal Adjust
Reserved
2
2
1
1
CYWUSB6935
Default: 0x00
Default: 0x00
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