PHD User Guide
18
4.1.1.1.
Low-side output connections
When connecting low-side outputs, note that
•
low-side outputs are connected to a common internal ground point that is connected to the battery
ground (GND).
•
low-side outputs provide switched ground to any load type in a vehicle.
•
low-side outputs can sink up to 0.5 A.
When conne
cting a load to a low-side output, ensure that the load will not drive currents greater than the
maximum specified peak current or the maximum specified continuous current.
The following shows a typical low-side output connection:
Internal to product
Low-Side
Output
Application
Load
Battery
Figure 4.1. Low-side outputs with current sense installation connections
4.2. Sensor and regulated supply outputs
The PHD has 2 types of sensor supply pins, labeled USB_VBUS, P5V0 and P12V0 dedicated to providing
power to external sensors and devices.
•
5V USB or sensor supply
•
12V regulated supply
The PHD28 has 1 of each type of supply:
•
USB_VBUS / P5V0 is a 5V supply
•
P12V0 is a 12V regulated supply
The PHD50 and PHD70 have 2 x 5V and 1 x 12V supplies:
•
USB_VBUS and P5V0 are 5V supplies
•
P12V0 are 2 pins assigned to the 12V regulated supply
Warning!
Do not drive more than 500 mA of current through the combined pins. Doing so
will cause the pins to protect themselves by dropping the voltage, which will result in a lack of
power to the sensors and other devices, causing unknown vehicle responses.