CYRF7936-40LTXC Cypress Semiconductor Corp, CYRF7936-40LTXC Datasheet - Page 5

• Manufacturer Part Number: CYRF7936-40LTXC
• Description: IC TXRX CYFI 2.4GHZ 40VQFN
• Manufacturer: Cypress Semiconductor Corp

Specifications of CYRF7936-40LTXC

• Frequency: 2.4GHz
• Data Rate - Maximum: 1Mbps
• Modulation Or Protocol: DSSS, GFSK
• Applications: Home/Building Automation, Industrial Control and Monitoring
• Power - Output: 4dBm
• Sensitivity: -97dBm
• Voltage - Supply: 1.8 V ~ 3.6 V
• Current - Receiving: 21mA
• Current - Transmitting: 21mA
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Operating Temperature: 0°C ~ 70°C
• Package / Case: 40-VQFN Exposed Pad, 40-HVQFN, 40-SQFN, 40-DHVQFN
• Receiving Current: 21.2mA
• Transmitting Current: 26.2mA
• Data Rate: 1Mbps
• Frequency Range: 2.4GHz To 2.497GHz
• Modulation Type: GFSK
• Rf Ic Case Style: QFN
• No. Of Pins: 40
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Memory Size: -
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Packet Buffers
All data transmission and reception use the 16-byte packet
buffers: one for transmission and one for reception.
The transmit buffer allows loading a complete packet of up to
16 bytes of payload data in one burst SPI transaction. This is
then transmitted with no further MCU intervention. Similarly, the
receive buffer allows receiving an entire packet of payload data
up to 16 bytes with no firmware intervention required until the
packet reception is complete.
Maximum packet length depends on the accuracy of the clock on
each end of the link. Packet lengths up to 40 bytes are supported
when the delta between the transmitter and receiver crystals is
60 ppm or better. Interrupts are provided to allow an MCU to use
the transmit and receive buffers as FIFOs. When transmitting a
packet longer than 16 bytes, the MCU can load 16 bytes initially,
and add further bytes to the transmit buffer as transmission of
data creates space in the buffer. Similarly, when receiving
packets longer than 16 bytes, the MCU must fetch received data
from the FIFO periodically during packet reception to prevent it
from overflowing.
Auto Transaction Sequencer (ATS)
The CYRF7936 IC provides automated support for transmission
and reception of acknowledged data packets.
When transmitting in transaction mode, the device automatically:
■
■
■
■
■
Document Number: 001-48013 Rev *E
Starts the crystal and synthesizer
Enters transmit mode
Transmits the packet in the transmit buffer
Transitions to receive mode and waits for an ACK packet
Transitions to the transaction end state when an ACK packet
is received or a timeout period expires
P re a m b le
n x 1 6 u s
P
1 s t F ra m in g
P r e a m b l e
S y m b o l*
S O P 1
n x 1 6 u s
P
1 s t F r a m i n g
S O P 1
S y m b o l *
2 n d F ra m in g
S y m b o l*
S O P 2
2 n d F r a m i n g
S y m b o l *
S O P 2
L e n g th
P a c k e t
Figure 3. Example ACK Packet Format
1 B y te
P e rio d
le n g th
Figure 2. Example Packet Format
P a y lo a d D a ta
r e c e i v e d p a c k e t .
C R C f i e l d f r o m
2 B y t e p e r i o d s
C R C 1 6
Similarly, when receiving in transaction mode, the device
automatically:
■
■
■
The contents of the packet buffers are not affected by the
transmission or reception of ACK packets.
In each case, the entire packet transaction takes place without
any need for MCU firmware action (as long as packets of 16
bytes or less are used). To transmit data, the MCU must load the
data packet to be transmitted, set the length, and set the TX GO
bit. Similarly, when receiving packets in transaction mode,
firmware must retrieve the fully received packet in response to
an interrupt request indicating reception of a packet.
Data Rates
The CYRF7936 IC supports the following data rates by
combining the PN code lengths and data transmission modes
described in the previous sections:
■
■
■
Waits in receive mode for a valid packet to be received
Transitions to transmit mode, transmits an ACK packet
Transitions to the transaction end state (receive mode to await
the next packet, and so on.)
1000 kbps (GFSK)
250 kbps (32 chip 8DR)
125 kbps (64 chip 8DR)
* N o t e : 3 2 o r 6 4 u s
*N o te :3 2 o r 6 4 u s
C R C 1 6
CYRF7936
Page 5 of 22
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