Salem60 is a high voltage (60V) step-up converter designed to drive capacitive micromachined ultrasonic transducers (CMUT). 

‍SALEMservice
‍SERVICE provides the reference voltage (REF) and current for all Salem modules. Register ENABLE controls SERVICE enable.  Once enabled and VDD is above the POR threshold (PORrise), the core reference is enabled.  If the reference is valid and VDD supply is above the undervoltage lockout, then Salem is active (ok_service). 

‍SALEMpulsar
‍PULSAR is a standard step-up controller (COT12A3SD).  The output voltage is register-controlled from 25V to 60V.  Once PULSAR is in regulation, PULSEgenerator is enabled.  PULSAR has cycle-by-cycle current limit protection set at 500mA. 

‍SALEMwaveform
‍WAVEFORM generates the pulses required to drive the transducer.  The pulse sequence is triggered by writing register ENABLE, bit2.  The pulse sequence can be configured to be single or double.  Pulse width is set through register-control from 50ns to 500ns.  There is a digital GPIO (PSEL) that is high when the WAVEFORM sequence is active. 

‍SALEMpulse
‍PULSE is a high voltage amplifier that drives a logic waveform signal between VP and PUG.   VP should be connected to the high voltage rail (PULSAR).  PUG should be connected to the ground plane.  The amplifier is design to slew at 0.3V/ns with a 20pF load.  There is a factory configuration to have PULSE either connected to PUG when enable_pulse is low or PULSE to float.
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