X-NUCLEO-OUT07A1 Industrial digital output expansion board based on IPS4260LM for STM32 Nucleo

The X-NUCLEO-OUT07A1 industrial digital output expansion board for STM32 Nucleo provides a powerful and flexible environment for the evaluation of the driving and diagnostic capabilities of the IPS4260LM quad low-side smart power solid state relay, in a digital output module connected to 0.5 A industrial loads.

Dual channels and single channel configurations are possible by proper setting of J9 and J10 (see below).

The X-NUCLEO-OUT07A1 interfaces with the microcontroller on the STM32 Nucleo via STISO620 and STISO621 and Arduino®R3 connectors. The expansion board can be connected to either a NUCLEO-F401RE or a NUCLEO-G431RB development board.

The digital isolators STISO620 and STISO621 (featuring 2.8k VRMS galvanic isolation) and the isolated dc-dc DC1 (featuring 3kVDC isolation) protects the logic side from the typical harsh environment on the process side.

The logic side is the application side of the MCU and it is supplied by the VISOL rail (3.3 or 5.0 V). When the X-NUCLEO-OUT07A1 is stacked on a NUCLEO-F401RE, or on a NUCLEO-G431RB, the VISOL is supplied by the Nucleo board if connected to a PC/Laptop by USB cable. If the X-NUCLEO-OUT07A1 is used standalone, then VISOL can be supplied by the CN6[4] (SW1 = close 1-2) or CN6[5] (SW1 = close 2-3).

The process side is the application side beyond the galvanic isolation barrier. On the process side there are two supply rails: the 5VP rail (5.0 V) and one rail between the 10VP (SW7 close 1-2) and the VFIELDRP rail (SW7 close 2-3).

Both the 5VP and the 10VP rails are generated by the DC1, while the VFIELDRP rail is supplied externally.

The 5VP rail supplies both the digital isolators and the red diagnostic LEDs D7 (open load detection) and D8 (overload and overtemperature diagnostic).

The 10VP rail supplies the IPS4260LM (U1): the loads are connected between the CN2[1, 2] and CN3[1, 2] connectors and the process side supply rail (typically 24 V). The reference rail (ground) of the power process side supply rail must be connected to CN1[2], too.

Alternatively (SW7 close 2-3) the VFILEDRP rail supplies U1: the loads are connected between the CN2[1, 2] and CN3[1, 2] connectors and the process side supply rail (typically 24 V). The positive pole and the ground of the power process side supply rail must be connected to CN1[1] and CN1[2], respectively.

The SW8 allows the selection of which external TVS is used for the demagnetization of the inductive load and for sustaining the surge pulse on the output stage. Setting SW8 close to 1-2 the D9 is selected: this selection is valid both if U1 is supplied by the 10VP or by the VFIELDRP rail. Setting SW8 close to 2-3 the D10 is selected: this selection is valid only when U1 is supplied by the VFIELDRP.

The four low side power switches integrated in U1 can be activated/deactivated by the control signals IN1L, IN2L, IN3L and IN4L: by default, these signals are controlled by CN5[2,1] and CN9[8,7] through SW2[1-2], SW3[1-2], SW4[1-2] (IN4L goes through direct connection to U6). .

The four on board green LEDS D1, D2, D3, and D4 can be enabled by closing J6[1-2, 3-4, 5-6, 7-8]: these are driven ON/OFF according to the status (active/inactive) of the respective low side power switch (OUT1, OUT2, OUT3, OUT4) integrated in the U1.

The user can enable/disable the cutoff featured by U1 by J8[7-8]: open (cutoff active) or closing (cutoff disabled).

Also, J8[1-2, 3-4, 5-6] allows the user can set the desired current limitation level (J8[1-2] ==> 0.5A; J8[3-4] ==> 1A; J8[5-6] ==> 2A). The J9 and J10 allow the user to easily parallelize the input and output channels and achieve dual channel low side (J9[1-2, 5-6] and J10[1-2, 5-6]) or single channel low side (J9[1-2, 3-4, 5-6] and J10[1-2, 3-4, 5-6]).

The open load detection feature offered by U1 is enabled only when the J7[1-2, 3-4, 5-6, 7-8] are closed. Note that the signalization of D7 must be ignored when J7 is open.

The two cumulative diagnostic signals FLTL (overload and overtemperature) and OLL (open load) are available on the CN9[6] (SW6[1-2]) and on CN9[5], respectively.

The four per-channel overload diagnostic signals DIAG1L, DIAG2L, DIAG3L, DIAG4L are available on the CN5[10] (SW5[1-2]), CN5[9], CN8[6] and CN8[5], respectively.

It is also possible to evaluate a system composed of a X-NUCLEO-OUT07A1 stacked on other expansion boards.