Texas Instruments TRF7970A Instruction Manual page 65

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6.14.3.2.10 Regulator and I/O Control Register (0x0B)
Function: Control the three voltage regulators
Default: 0x87 at POR = H or EN = L
Bit Name
0 = Manual settings; see B0
to B2 in
B7 auto_reg
Table 6-40
1 = Automatic setting
Support for external power
B6 en_ext_pa
amplifier
1 = enable low peripheral
B5 io_low
communication voltage
B4 Unused No function
B3 Unused No function
B2 vrs2
Voltage set MSB voltage
B1 vrs1
set LSB
B0 vrs0
Option Bits Setting in Control Register
Register
B7 B6
00
0B 0
0B 0
0B 0
0B 0
0B 0
0B 0
0B 0
0B 0
0B 0
Option Bits Setting in Control Register
Register
B7 B6
00
0B 0
0B 0
0B 0
0B 0
0B 0
0B 0
0B 0
0B 0
0B 0
Copyright © 2011–2014, Texas Instruments Incorporated
Table 6-38. Regulator and I/O Control Register (0x0B)
Function
Table 6-39 and Auto system sets V
V
DD_X
Internal peak detectors are disabled, receiver inputs (RX_IN1 and RX_IN2)
accept externally demodulated subcarrier. At the same time ASK/OOK pin 12
becomes modulation output for external TX amplifier.
When B5 = 1, maintains the output driving capabilities of the I/O pins connected
to the level shifter under low voltage operation. Should be set 1 when V
voltage is between 1.8 V to 2.7 V.
Default is 0.
Default is 0.
Vrs3_5 = L: V
Table 6-40
Table 6-39. Supply-Regulator Setting – Manual 5-V System
B5 B4 B3 B2
1
1
1
1
0
0
0
0
Table 6-40. Supply-Regulator Setting – Manual 3-V System
B5 B4 B3 B2
1
1
1
1
0
0
0
0
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SLOS743K – AUGUST 2011 – REVISED APRIL 2014
Description
= V – 250 mV and V
DD_RF IN
= V – 250 mV, but not higher than 3.4 V.
IN
, V , V range 2.7 V to 3.4 V; see
DD_RF DD_A DD_X
B1 B0
1 5-V system
Manual regulator setting
1 1 V = 5 V, V
DD_RF
1 0 V = 4.9 V, V
DD_RF
0 1 V = 4.8 V, V
DD_RF
0 0 V = 4.7 V, V
DD_RF
1 1 V = 4.6 V, V
DD_RF
1 0 V = 4.5 V, V
DD_RF
0 1 V = 4.4 V, V
DD_RF
0 0 V = 4.3 V, V
DD_RF
B1 B0
0 3-V system
Manual regulator setting
1 1 V = 3.4 V, V
DD_RF
1 0 V = 3.3 V, V
DD_RF
0 1 V = 3.2 V, V
DD_RF
0 0 V = 3.1 V, V
DD_RF
1 1 V = 3.0 V, V
DD_RF
1 0 V = 2.9 V, V
DD_RF
0 1 V = 2.8 V, V
DD_RF
0 0 V = 2.7 V, V
DD_RF
TRF7970A
TRF7970A
= V – 250 mV and
DD_A IN
Table 6-39
Action
= 3.4 V, V = 3.4 V
DD_A DD_X
= 3.4 V, V = 3.4 V
DD_A DD_X
= 3.4 V, V = 3.4 V
DD_A DD_X
= 3.4 V, V = 3.4 V
DD_A DD_X
= 3.4 V, V = 3.4 V
DD_A DD_X
= 3.4 V, V = 3.4 V
DD_A DD_X
= 3.4 V, V = 3.4 V
DD_A DD_X
= 3.4 V, V = 3.4 V
DD_A DD_X
Action
and V = 3.4 V
DD_A DD_X
and V = 3.3 V
DD_A DD_X
and V = 3.2 V
DD_A DD_X
and V = 3.1 V
DD_A DD_X
and V = 3.0 V
DD_A DD_X
and V = 2.9 V
DD_A DD_X
and V = 2.8 V
DD_A DD_X
and V = 2.7 V
DD_A DD_X
Detailed Description
DD_I/O
and
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