ZHCS363L August 2011 – March 2017 TRF7970A
PRODUCTION DATA.
Table 6-38 describes the Regulator and I/O Control register.
Function: Control the three voltage regulators | |||
Default: 0x87 at POR = H or EN = L | |||
Bit | Name | Function | Description |
B7 | auto_reg | 0 = Manual settings; see B0 to B2 in Table 6-39 and Table 6-40 1 = Automatic setting (see Table 6-41 and Table 6-42) |
Auto system sets VDD_RF = VIN – 250 mV and VDD_A = VIN – 250 mV and VDD_X= VIN – 250 mV, but not higher than 3.4 V. |
B6 | en_ext_pa | Support for external power amplifier | 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. |
B5 | io_low | 1 = enable low peripheral communication voltage | 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 VDD_I/O 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 set LSB | Vrs3_5 = L: VDD_RF, VDD_A, VDD_X range 2.7 V to 3.4 V; see Table 6-39 and Table 6-40 |
B1 | vrs1 | ||
B0 | vrs0 |
REGISTER | OPTION BITS SETTING IN CONTROL 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 | VDD_RF = 5 V, VDD_A = 3.4 V, VDD_X = 3.4 V | ||||
0B | 0 | 1 | 1 | 0 | VDD_RF = 4.9 V, VDD_A = 3.4 V, VDD_X = 3.4 V | ||||
0B | 0 | 1 | 0 | 1 | VDD_RF = 4.8 V, VDD_A = 3.4 V, VDD_X = 3.4 V | ||||
0B | 0 | 1 | 0 | 0 | VDD_RF = 4.7 V, VDD_A = 3.4 V, VDD_X = 3.4 V | ||||
0B | 0 | 0 | 1 | 1 | VDD_RF = 4.6 V, VDD_A = 3.4 V, VDD_X = 3.4 V | ||||
0B | 0 | 0 | 1 | 0 | VDD_RF = 4.5 V, VDD_A = 3.4 V, VDD_X = 3.4 V | ||||
0B | 0 | 0 | 0 | 1 | VDD_RF = 4.4 V, VDD_A = 3.4 V, VDD_X = 3.4 V | ||||
0B | 0 | 0 | 0 | 0 | VDD_RF = 4.3 V, VDD_A = 3.4 V, VDD_X = 3.4 V |
REGISTER | OPTION BITS SETTING IN CONTROL 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 | VDD_RF = 3.4 V, VDD_A and VDD_X = 3.4 V | ||||
0B | 0 | 1 | 1 | 0 | VDD_RF = 3.3 V, VDD_A and VDD_X = 3.3 V | ||||
0B | 0 | 1 | 0 | 1 | VDD_RF = 3.2 V, VDD_A and VDD_X = 3.2 V | ||||
0B | 0 | 1 | 0 | 0 | VDD_RF = 3.1 V, VDD_A and VDD_X = 3.1 V | ||||
0B | 0 | 0 | 1 | 1 | VDD_RF = 3.0 V, VDD_A and VDD_X = 3.0 V | ||||
0B | 0 | 0 | 1 | 0 | VDD_RF = 2.9 V, VDD_A and VDD_X = 2.9 V | ||||
0B | 0 | 0 | 0 | 1 | VDD_RF = 2.8 V, VDD_A and VDD_X = 2.8 V | ||||
0B | 0 | 0 | 0 | 0 | VDD_RF = 2.7 V, VDD_A and VDD_X = 2.7 V |
REGISTER | OPTION BITS SETTING IN CONTROL REGISTER | ACTION | |||||||
---|---|---|---|---|---|---|---|---|---|
B7 | B6 | B5 | B4 | B3 | B2 | B1 | B0 | ||
00 | 1 | 5-V system | |||||||
0B | 1 | x(1) | 0 | 0 | Automatic regulator setting 400-mV difference |
REGISTER | OPTION BITS SETTING IN CONTROL REGISTER | ACTION | |||||||
---|---|---|---|---|---|---|---|---|---|
B7 | B6 | B5 | B4 | B3 | B2 | B1 | B0 | ||
00 | 0 | 3-V system | |||||||
0B | 1 | x(1) | 0 | 0 | Automatic regulator setting 400-mV difference |