TRF7970AEVM【PDF 64/85 页】EVAL MODULE FOR TRF7970A

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TRF7970A

SLOS743K – AUGUST 2011 – REVISED 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

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Bit

Name

Function

Description

0 = Manual settings; see B0

B7

auto_reg

to B2 in Table 6-39 and

Table 6-40

Auto system sets V DD_RF = V IN – 250 mV and V DD_A = V IN – 250 mV and

V DD_X = V IN – 250 mV, but not higher than 3.4 V.

1 = Automatic setting

B6

B5

B4

B3

B2

B1

B0

en_ext_pa

io_low

Unused

Unused

vrs2

vrs1

vrs0

Support for external power

amplifier

1 = enable low peripheral

communication voltage

No function

No function

Voltage set MSB voltage

set LSB

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 DD_I/O

voltage is between 1.8 V to 2.7 V.

Default is 0.

Default is 0.

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

Table 6-40

Table 6-39. Supply-Regulator Setting – Manual 5-V System

Register

B7

Option Bits Setting in Control Register

B6 B5 B4 B3 B2 B1

B0

Action

00

0B

0

1

5-V system

Manual regulator setting

0B

0B

0B

0B

0B

0B

0B

0B

0

0

0

0

0

0

0

0

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

Table 6-40. Supply-Regulator Setting – Manual 3-V System

Register

B7

Option Bits Setting in Control Register

B6 B5 B4 B3 B2 B1

B0

Action

00

0B

0

0

3-V system

Manual regulator setting

0B

0B

0B

0B

0B

0B

0B

0B

0

0

0

0

0

0

0

0

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 and V DD_X = 3.4 V

V DD_RF = 3.3 V, V DD_A and V DD_X = 3.3 V

V DD_RF = 3.2 V, V DD_A and V DD_X = 3.2 V

V DD_RF = 3.1 V, V DD_A and V DD_X = 3.1 V

V DD_RF = 3.0 V, V DD_A and V DD_X = 3.0 V

V DD_RF = 2.9 V, V DD_A and V DD_X = 2.9 V

V DD_RF = 2.8 V, V DD_A and V DD_X = 2.8 V

V DD_RF = 2.7 V, V DD_A and V DD_X = 2.7 V

64

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