AS3977-BQFU austriamicrosystems, AS3977-BQFU Datasheet - Page 32

• Manufacturer Part Number: AS3977-BQFU
• Description: IC RF TRANSMITTER FSK 16-QFN
• Manufacturer: austriamicrosystems

Specifications of AS3977-BQFU

• Frequency: 300MHz ~ 928MHz
• Applications: ISM
• Modulation Or Protocol: FSK
• Data Rate - Maximum: 100 kbps
• Power - Output: 10dBm
• Data Interface: PCB, Surface Mount
• Antenna Connector: PCB, Surface Mount
• Voltage - Supply: 2 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 16-VQFN Exposed Pad, 16-HVQFN, 16-SQFN, 16-DHVQFN
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Features: -
• Memory Size: -
• Current - Transmitting: -

AS3977
Data Sheet - A p p l i c a t i o n I n f o r m a t i o n
Table 23. Configuration Registers Description
Special Bits
The following paragraphs provide a brief description of special bits used for Transmitter Interface functionality.
LT (Lock Transmit)
The Lock Transmit bit will be set each time the circuit goes in Power Down Mode. When the bit is set, the power
amplifier of the AS3977 cannot be activated. TX commands will be anyway accepted but without any “external” and
visible effect.
A low has to be written before starting any RF-Transmission. The first write command can be responsible for a wake
up event of the circuit and to release Power Down Mode, which will lead to the inactive state. This signal will be
activated whenever the power supply is dramatically under the threshold for safe workings of analog circuits during
transmit operations. If the supply voltage is under the threshold during transmit, the read back value is “1” and this can
indicate a non finished transmission.
www.austriamicrosystems.com
Temperature Sensor section
Power Down Control
Temperature Sensor and Lock Detector Output (read only)
M<11:10>
M<15:12>
O<15:11>
L<12:10>
L<14:13>
Register
N<15:9>
M<1:0>
M<9:2>
O<9:0>
N<7:2>
O<10>
L<15>
N<0>
N<1>
N<8>
(see Power On Reset on page 22)
CLKS<1:0>
PSC<2:0>
TCV<7:0>
ASC<1:0>
TSNRST
reserved
TS<9:0>
MCCDS
SETPD
Name
TSON
<2:0>
LD
-
-
-
application dependent
application dependent
application dependent
application dependent
application dependent
Default Value
0000000
0000000
Revision 3.5
0010
0
1
0
-
-
-
Clock output driver driving strength setting
0 (000): 4mA (maximum) driving strength
…
7 (111): 1mA (minimum) driving strength
MCCLK source selection
0 (00): MCCLK connected to pre scaler
output
1 (01): MCCLK connected to baud rate
generator output
2 (10): MCCLK connected to baud rate
generator output but inverted
3 (11): not used
Micro controller clock pre scaler division ratio
f
Baud rate generator counter value
Baud rate generator after scaler division ratio
f
reserved Bits: set to Binary 0010 for normal
mode of operation
0: Temperature sensor off
1: Temperature sensor on
Reset of temperature sensor, active=low
reserved Bits: set to Binary 0000000 for
normal mode of operation
Set power down, active=high
Reset on page 22)
reserved Bits: set to Binary 0000000 for
normal mode of operation
Temperature sensor output
Lock detector output
reserved
OUT
OUT
=2
=2
-PSC<2:0>
-ASC<1:0>
*f
*f
Description
IN
IN
(see Power On
32 - 45