ST25RU3993 Datasheet, PDF (55/90 Pages) STMicroelectronics – Integrated supply regulators

ST25RU3993
Register description
3.2.11
RF output and LO control register
Address: 0Ch
Type: RW
Table 22. RF output and LO control register
Bit
Name Default
Function
Comments
7
eTX[7]
0
LO (local oscillator) ^{0: Nominal}
gain
1: 6 dB gain in LO path
6
eTX[6]
0: LO source is RFOPX, RFONX
0
LO source selection _{1: LO source is pre-driver for the internal}
PA
5
eTX[5]
Enable internal
0
V_{DD_PA} voltage
regulator
V_{DD_PA} regulator is automatically enabled
if the internal PA is enabled via eTX[3:2]
4
RFU
0 Not used
RFU, do not set
3
eTX[3]
2
eTX[2]
0
00: Disable
0
Main PA enable and
bias current for main
PA pre-driver
01: 7 mA
10: 14 mA
11: 22 mA
1
eTX[1]
0
eTX[0]
1
Enable RF low-
00: Disable
power output and ^{01: 7 mA}
0
bias current for RF _{10: 14 mA (default)}
output stage.
11: 22 mA
3.2.12
Miscellaneous register 1
Address: 0Dh
Type: RW
Table 23. Miscellaneous register 1
Bit
Name Default
Function
Comments
7
hs_output
Strong, fast
1 communication
output drivers
Valid for MISO, IRQ, CLSYS
6
hs_oad
0
Strong, fast test
output drivers
Valid for OAD, OAD2, ADC
5
miso_pd2
0
Pull down resistor:
NCS = 0
1: Enable a pull down resistor on MISO,
when NCS is low and MISO is not driven
by the ST25RU3993
4
miso_pd1
0
Pull down resistor: 1: Enable a pull down resistor on MISO
NCS = 1
when NCS is high
3
open_dr
0
Open drain N-MOS
outputs
Valid for MISO, IRQ, CLSYS
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