User's Manual

Table Of Contents
TRF7970A
www.ti.com
SLOS743K AUGUST 2011REVISED APRIL 2014
6.14.3.2.10 Regulator and I/O Control Register (0x0B)
Table 6-38. Regulator and I/O Control Register (0x0B)
Function: Control the three voltage regulators
Default: 0x87 at POR = H or EN = L
Bit Name Function Description
0 = Manual settings; see B0
to B2 in Table 6-39 and Auto system sets V
DD_RF
= V
IN
250 mV and V
DD_A
= V
IN
250 mV and
B7 auto_reg
Table 6-40 V
DD_X
= V
IN
250 mV, but not higher than 3.4 V.
1 = Automatic setting
Internal peak detectors are disabled, receiver inputs (RX_IN1 and RX_IN2)
Support for external power
B6 en_ext_pa accept externally demodulated subcarrier. At the same time ASK/OOK pin 12
amplifier
becomes modulation output for external TX amplifier.
When B5 = 1, maintains the output driving capabilities of the I/O pins connected
1 = enable low peripheral
B5 io_low to the level shifter under low voltage operation. Should be set 1 when V
DD_I/O
communication voltage
voltage is between 1.8 V to 2.7 V.
B4 Unused No function Default is 0.
B3 Unused No function Default is 0.
B2 vrs2
Voltage set MSB voltage Vrs3_5 = L: V
DD_RF
, V
DD_A
, V
DD_X
range 2.7 V to 3.4 V; see Table 6-39 and
B1 vrs1
set LSB Table 6-40
B0 vrs0
Table 6-39. Supply-Regulator Setting Manual 5-V System
Option Bits Setting in Control Register
Register Action
B7 B6 B5 B4 B3 B2 B1 B0
00 1 5-V system
0B 0 Manual regulator setting
0B 0 1 1 1 V
DD_RF
= 5 V, V
DD_A
= 3.4 V, V
DD_X
= 3.4 V
0B 0 1 1 0 V
DD_RF
= 4.9 V, V
DD_A
= 3.4 V, V
DD_X
= 3.4 V
0B 0 1 0 1 V
DD_RF
= 4.8 V, V
DD_A
= 3.4 V, V
DD_X
= 3.4 V
0B 0 1 0 0 V
DD_RF
= 4.7 V, V
DD_A
= 3.4 V, V
DD_X
= 3.4 V
0B 0 0 1 1 V
DD_RF
= 4.6 V, V
DD_A
= 3.4 V, V
DD_X
= 3.4 V
0B 0 0 1 0 V
DD_RF
= 4.5 V, V
DD_A
= 3.4 V, V
DD_X
= 3.4 V
0B 0 0 0 1 V
DD_RF
= 4.4 V, V
DD_A
= 3.4 V, V
DD_X
= 3.4 V
0B 0 0 0 0 V
DD_RF
= 4.3 V, V
DD_A
= 3.4 V, V
DD_X
= 3.4 V
Table 6-40. Supply-Regulator Setting Manual 3-V System
Option Bits Setting in Control Register
Register Action
B7 B6 B5 B4 B3 B2 B1 B0
00 0 3-V system
0B 0 Manual regulator setting
0B 0 1 1 1 V
DD_RF
= 3.4 V, V
DD_A
and V
DD_X
= 3.4 V
0B 0 1 1 0 V
DD_RF
= 3.3 V, V
DD_A
and V
DD_X
= 3.3 V
0B 0 1 0 1 V
DD_RF
= 3.2 V, V
DD_A
and V
DD_X
= 3.2 V
0B 0 1 0 0 V
DD_RF
= 3.1 V, V
DD_A
and V
DD_X
= 3.1 V
0B 0 0 1 1 V
DD_RF
= 3.0 V, V
DD_A
and V
DD_X
= 3.0 V
0B 0 0 1 0 V
DD_RF
= 2.9 V, V
DD_A
and V
DD_X
= 2.9 V
0B 0 0 0 1 V
DD_RF
= 2.8 V, V
DD_A
and V
DD_X
= 2.8 V
0B 0 0 0 0 V
DD_RF
= 2.7 V, V
DD_A
and V
DD_X
= 2.7 V
Copyright © 2011–2014, Texas Instruments Incorporated Detailed Description 65
Submit Documentation Feedback
Product Folder Links: TRF7970A