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TRF7970A
www.ti.com
SLOS743K – AUGUST 2011 – REVISED APRIL 2014
6.3.2
Supply Regulator Settings
The input supply voltage mode of the reader needs to be selected. This is done in the Chip Status Control
register (0x00). Bit 0 in register 0x00 selects between 5-V or 3-V input supply voltage. The default
configuration is 5 V, which reflects an operating supply voltage range of 4.3 V to 5.5 V. If the supply
voltage is below 4.3 V, the 3-V configuration should be used.
The various regulators can be configured to operate in automatic or manual mode. This is done in the
Regulator and I/O Control register (0x0B) as shown in Table 6-1 and Table 6-2 .
Table 6-1. Supply Regulator Setting: 5-V System
Register
Option Bits Setting in Regulator Control Register
(1)
Address
(hex)
B7
B6
B5
B4
B3
B2
B1
B0
Comments
Automatic Mode (default)
0B
1
x
x
x
x
x
0
0
Automatic regulator setting 400-mV difference
Manual Mode
0B
0B
0B
0B
0B
0B
0B
0B
0
0
0
0
0
0
0
0
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
V DD_RF = 5 V, V DD_A = 3.4 V, V DD_X = 3.4 V
V DD_RF = 4.9 V, V DD_A = 3.4 V, V DD_X = 3.4 V
V DD_RF = 4.8 V, V DD_A = 3.4 V, V DD_X = 3.4 V
V DD_RF = 4.7 V, V DD_A = 3.4 V, V DD_X = 3.4 V
V DD_RF = 4.6 V, V DD_A = 3.4 V, V DD_X = 3.4 V
V DD_RF = 4.5 V, V DD_A = 3.4 V, V DD_X = 3.4 V
V DD_RF = 4.4 V, V DD_A = 3.4 V, V DD_X = 3.4 V
V DD_RF = 4.3 V, V DD_A = 3.4 V, V DD_X = 3.4 V
(1)
x = Don't care
Table 6-2. Supply Regulator Setting: 3-V System
Register
Option Bits Setting in Regulator Control Register
(1)
Address
(hex)
B7
B6
B5
B4
B3
B2
B1
B0
Comments
Automatic Mode (default)
0B
1
x
x
x
x
x
0
0
Automatic regulator setting 400-mV difference
Manual Mode
0B
0B
0B
0B
0B
0B
0B
0B
0
0
0
0
0
0
0
0
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
1
1
1
1
0
0
0
0
1
1
0
0
1
1
0
0
1
0
1
0
1
0
1
0
V DD_RF = 3.4 V, V DD_A = 3.4 V, V DD_X = 3.4 V
V DD_RF = 3.3 V, V DD_A = 3.3 V, V DD_X = 3.3 V
V DD_RF = 3.2 V, V DD_A = 3.2 V, V DD_X = 3.2 V
V DD_RF = 3.1 V, V DD_A = 3.1 V, V DD_X = 3.1 V
V DD_RF = 3.0 V, V DD_A = 3.0 V, V DD_X = 3.0 V
V DD_RF = 2.9 V, V DD_A = 2.9 V, V DD_X = 2.9 V
V DD_RF = 2.8 V, V DD_A = 2.8 V, V DD_X = 2.8 V
V DD_RF = 2.7 V, V DD_A = 2.7 V, V DD_X = 2.7 V
(1)
x = Don't care
The regulator configuration function adjusts the regulator outputs by default to 400 mV below V IN level, but
not higher than 5 V for V DD_RF , 3.4 V for V DD_A and V DD_X . This ensures the highest possible supply
voltage for the RF output stage while maintaining an adequate PSRR (power supply rejection ratio).
Copyright ? 2011–2014, Texas Instruments Incorporated
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