User Guide
39
Outputs
6.2. Low-Side Output with Current Sense
The low-side output with current sense is used for switching ground to load, using
either a pulse-width modulated (PWM)
signal or an on/off signal. It also has the
ability to sense current that is provided to the load, through an amplifier circuit.
The CM2115 has 1 low-side output:
OUTPUT13_2A5_LS
The length of the duty cycle is defined in the application software.
Note:
Current flow is interrupted when using low-side outputs as a PWM
signal, because the outputs are not on continuously. Therefore, current
feedback control systems should use a high-side output for PWM signals, and
a low-side output (turned on at 100%) for sensing current.
When low-side outputs are used as an on/off signal, the output provides ground
when in the on state (the application software is responsible for switching low-
side outputs on and off).
When low-side outputs are used to sense current, the application software will
monitor the current flowing into the low-side output, and based on the amount of
current, will turn the output either on or off.
6.2.1. Low-Side Output with Current Sense Capabilities
This output provides 2.5 A maximum continuous current with accurate current
sensing. The current sensing provides accurate readings to detect single load
disconnect on parallel driven load applications. The current sensing can also be
used for current control of hydraulic coils when used with a corresponding high-
side driver which performs the PWM function. These outputs can be used to
provide a fast PWM signal to functions requiring accurate higher speed PWM
signal control.
