DEEPSLEEP_MODE=OFF, VREF_SEL=SRSS, IZTAT_SEL=SRSS, AREF_MODE=NORMAL
global AREF control
| AREF_MODE | Control bit to trade off AREF settling and noise performance 0 (NORMAL): Nominal noise normal startup mode (meets normal mode settling and noise specifications) 1 (FAST_START): High noise fast startup mode (meets fast mode settling and noise specifications) |
| AREF_BIAS_SCALE | BIAS Current Control for all AREF Amplifiers. (These are risk mitigation bits that should not be touched by the customer: the impact on IDDA/noise/startup still needs to be characterized) 0: 125nA (reduced bias: reduction in total AREF IDDA, higher noise and longer startup times) 1: 250nA (‘default’ setting to meet bandgap performance (noise/startup) and IDDA specifications) 2: 375nA (increased bias: increase in total AREF IDDA, lower noise and shorter startup times) 3: 500nA (further increased bias: increase in total AREF IDDA, lower noise and shorter startup times) |
| AREF_RMB | AREF control signals (RMB). Bit 0: Manual VBG startup circuit enable 0: normal VBG startup circuit operation 1: VBG startup circuit is forced ‘always on’ Bit 1: Manual disable of IPTAT2 DAC 0: normal IPTAT2 DAC operation 1: PTAT2 DAC is disabled while VBG startup is active Bit 2: Manual enable of VBG offset correction DAC 0: normal VBG offset correction DAC operation 1: VBG offset correction DAC is enabled while VBG startup is active |
| CTB_IPTAT_SCALE | CTB IPTAT current scaler. This bit must be set in order to operate the CTB amplifiers in the lowest power mode. This bit is chip-wide (controls all CTB amplifiers). 0: 1uA 1: 100nA |
| CTB_IPTAT_REDIRECT | Re-direct the CTB IPTAT output current. This can be used to reduce amplifier bias glitches during power mode transitions (for PSoC4A/B DSAB backwards compatibility).
0: Opamp *Note that in Deep Sleep, the AREF IZTAT and/or IPTAT currents can be disabled and therefore the corresponding Opamp |
| IZTAT_SEL | iztat current select control 0 (SRSS): Use 250nA IZTAT from SRSS 1 (LOCAL): Use locally generated 250nA |
| CLOCK_PUMP_PERI_SEL | CTBm charge pump clock source select. This field has nothing to do with the AREF. 0: Use the dedicated pump clock from SRSS (default) 1: Use one of the CLK_PERI dividers |
| VREF_SEL | bandgap voltage select control 0 (SRSS): Use 0.8V Vref from SRSS 1 (LOCAL): Use locally generated Vref 2 (EXTERNAL): Use externally supplied Vref (aref_ext_vref) |
| DEEPSLEEP_MODE | AREF DeepSleep Operation Modes (only applies if DEEPSLEEP_ON = 1) 0 (OFF): All blocks ‘OFF’ in DeepSleep 1 (IPTAT): IPTAT bias generator ‘ON’ in DeepSleep (used for fast AREF wakeup only: IPTAT outputs not available) 2 (IPTAT_IZTAT): IPTAT bias generator and outputs ‘ON’ in DeepSleep (used for biasing the CTBm with a PTAT current only in deepsleep) *Note that this mode also requires that the CTB_IPTAT_REDIRECT be set if the CTBm opamp is to operate in DeepSleep 3 (IPTAT_IZTAT_VREF): IPTAT, VREF, and IZTAT generators ‘ON’ in DeepSleep. This mode provides identical AREF functionality in DeepSleep as in the Active mode. |
| DEEPSLEEP_ON |
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| ENABLED | Disable AREF |