MLX16305 Datasheet, PDF (9/29 Pages) Melexis Microelectronic Systems – Interlock switch sensor interface IC

MLX16305
Interlock switch sensor interface IC
8.5. Digital Inputs
DEFINITIONS:
• Digital input pins ENABLE, VI_CTRL and MUX_SENSE[0:2] have TTL characteristic.
Additionally these pins have internal pull downs for a defined reset behavior of the complete
system.
• Logic levels : LOW : V ≤ V_IL and HIGH : V ≥ V_IH
• Bit representation.
To select SENSE channel 1, set
• MUX_SENSE0: 0
• MUX_SENSE1: 0
• MUX_SENSE2: 1
In his document this is represented as MUX_SENSE[0:2]=001b
FUNCTIONALITY:
• MUX_SENSE[0:2] has a double function
o It controls the multiplexer that selects the channel that is to be sensed/measured
o And these inputs are latched into MuxSenseLatched [0:2] when ENABLE goes high.
• ENABLE has a double function
o When Enable =0 the MuxSenseLatched [0:2] signals are identical to the MUX_SENSE
inputs. When Enable=1, the MUX_SENSE signals are latched into MuxSenseLatched
[0:2]. This way a different channel can be sensed, from the one supplied (MUX_SENSE
≠ MuxSenseLatched).
o Enable resets MUX_SUP to 000b when ENABLE is logic low. This disconnects all
channels from the voltage regulator (Isense=0mA) and activates a weak pull down on all
pins.
• VI_CTRL selects Current Mode or Voltage Mode (see below)
3901016305
Rev. 005
Page 9 of 29
Data Sheet
Oct/06