Garrett 712120 VNT Hella 6NW 008 412 actuator.
Garrett 712120 VNT Hella 6NW 008 412 actuator.
Did some testing on the PCB/microcontroller, after taking me a while to find out all pins of the parts on the PCB are somehow coated, so you have to slightly scratch or pinpoint the coating by putting a bit more force on the pins with the multimeter probes .. which can be quite a PITA when probing around for signals. I only had a simple power supply and DMV/multimeter at hand, so no oscilloscope measurements or function generator I could use. Also it was hard to measure continuity to trace down signal paths on the PCB or between pins because of the coating and coupling elements or capacitors and the like in between. I was also wondering if somebody knew if there's more parts on the backside of the PCB or if this is multi-layered??
Anyways, the microcontroller seems to indeed be the mentioned L9805E or variant thereof, going by the pins.. see below for what I found:
(pin numbers, = measured signal state, : signal description from datasheet)
Haven't checked these yet..
AD2-AD4
PA0/OCMP2_1-PA1/OCMP1_1
PA2/ICAP2_1-PA3/ICAP1_1
PA4/EXTCLK_1
PA5/OCMP2_2-PA6/OCMP1_2
PA7/ICAP2_2-PB0/ICAP1_2
PB1/EXTCLK_2
VPP/TM (pin 8 = low, static): Input. This pin must be held low during normal operating modes.
VDD (9, 42 = 5V, static): Output. 5V Power supply for digital circuits, from internal voltage regulator.
OSCIN (10, not checked): Input Oscillator pin.
OSCOUT (11, not checked): Output Oscillator pin.
GND (12, 43 = GND, static): Ground for digital circuits.
VBR (37, 38, 39 = 12V, static): Power supply for Right half-bridge.
OUTR (28, 29, 30 = 12V, see below): Output of Left half-bridge. (should probably say RIGHT half-bridge)
PGND (26, 27, 58, 59 = GND, static): Ground for power transistor.
OUTL (23, 24, 25 = 12V, see below): Output of Right half-bridge. (should probably say LEFT half-bridge)
VBL (14, 15, 16 = 12V, static): Power supply for Left half-bridge.
VB1 (40 = about 11V, ?): Power supply for voltage regulators.
VB2 (41 = about 9V, ?): Pre-regulated voltage for analog circuits.
CAN_L (44, probably going to some opto-coupler, not checked): Low side CAN bus output.
CAN_H (45, probably going to some opto-coupler, not checked): High side CAN bus input.
NRESET (46, not checked): Bidirectional. This active low signal forces the initialization of the MCU. This event is the top priority non maskable interrupt. It can be used to reset external peripherals.
PWMI (47, see below): PWM input. Directly connected to Input Capture 2 on Timer 2.
PWMO (48, see below): PWM output. Connected to the output of PWM2 module.
AGND (63 = GND, static): Ground for all analog circuitry (except power bridge).
VCC (64 = 5V, static): Output. 5V power supply for analog circuits, from internal voltage regulator.
I had placed the actuator so that on the right side i had the outer connector with the 5 pins and the power supply filter capacitor (big blue one), that way the MCU is also the same layout as depicted in Fig. 2 (pinout) of the datasheet.
OUTL, OUTR: connected to the motor terminals, where the poles are rising up along the wall of the black actuator plastic housing, with both being at the same static voltage level; level is the same from the MCU pins to the motor pins. When looking at it from top, the left motor terminal goes to OUTR and the right one to OUTL.
PWMI, PWMO: (imho) strange things happening here. They are somehow connected to the signal to Pin 4 (PWM) of the external actuator connector. With Pin 4 open, both go to 12V, and every 3 seconds there is a short grounding pulse. I guess that is what the Hella guy was referring to when he said there is a grounding pulse on error condition. This same signal can also be measured on the external Pin 4 when open.
For testing i also applied 5V to Pin 4 and noticed that the voltage would be static 5V at PWMI and PWMO. When disconnecting the 5V, it would go to 12V again, with the 0.33Hz GND pulse; but the PWMI would drop to 0 first and then apply 12V, whereas the PWMO went to 12V instantly. So somehow it seems PWMO is set up for mirroring or copying this signal?
The (TS?)SOP16 packaged 16 pin IC next to the inductive rotary position sensor field coil is used for just that (position sensing), but seems it's also some proprietary IC. Maybe PWMI/O is related to that one to determine rotor position? Haven't checked if there are common pins or something..
Something more to note.. Since I had the top of the actuator (motor, gearing, CIPOS rotor indicating the position) taken off, maybe there was an error condition present since the position of the actuator could not be determined.
Well long story short.. So far I haven't had any luck with getting my actuator to rotate except when i apply voltage straight to the motor terminals. Any input on the signalling parameters for the PWM on Pin 4 i have to feed in for commanding the position? I might look into rigging up that open collector stuff although i'm not sure how this would help.
In quest for some light on this i did some further investigations yesterday night, with the following results:
Did some testing on the PCB/microcontroller, after taking me a while to find out all pins of the parts on the PCB are somehow coated, so you have to slightly scratch or pinpoint the coating by putting a bit more force on the pins with the multimeter probes .. which can be quite a PITA when probing around for signals. I only had a simple power supply and DMV/multimeter at hand, so no oscilloscope measurements or function generator I could use. Also it was hard to measure continuity to trace down signal paths on the PCB or between pins because of the coating and coupling elements or capacitors and the like in between. I was also wondering if somebody knew if there's more parts on the backside of the PCB or if this is multi-layered??
Anyways, the microcontroller seems to indeed be the mentioned L9805E or variant thereof, going by the pins.. see below for what I found:
(pin numbers, = measured signal state, : signal description from datasheet)
Haven't checked these yet..
AD2-AD4
PA0/OCMP2_1-PA1/OCMP1_1
PA2/ICAP2_1-PA3/ICAP1_1
PA4/EXTCLK_1
PA5/OCMP2_2-PA6/OCMP1_2
PA7/ICAP2_2-PB0/ICAP1_2
PB1/EXTCLK_2
VPP/TM (pin 8 = low, static): Input. This pin must be held low during normal operating modes.
VDD (9, 42 = 5V, static): Output. 5V Power supply for digital circuits, from internal voltage regulator.
OSCIN (10, not checked): Input Oscillator pin.
OSCOUT (11, not checked): Output Oscillator pin.
GND (12, 43 = GND, static): Ground for digital circuits.
VBR (37, 38, 39 = 12V, static): Power supply for Right half-bridge.
OUTR (28, 29, 30 = 12V, see below): Output of Left half-bridge. (should probably say RIGHT half-bridge)
PGND (26, 27, 58, 59 = GND, static): Ground for power transistor.
OUTL (23, 24, 25 = 12V, see below): Output of Right half-bridge. (should probably say LEFT half-bridge)
VBL (14, 15, 16 = 12V, static): Power supply for Left half-bridge.
VB1 (40 = about 11V, ?): Power supply for voltage regulators.
VB2 (41 = about 9V, ?): Pre-regulated voltage for analog circuits.
CAN_L (44, probably going to some opto-coupler, not checked): Low side CAN bus output.
CAN_H (45, probably going to some opto-coupler, not checked): High side CAN bus input.
NRESET (46, not checked): Bidirectional. This active low signal forces the initialization of the MCU. This event is the top priority non maskable interrupt. It can be used to reset external peripherals.
PWMI (47, see below): PWM input. Directly connected to Input Capture 2 on Timer 2.
PWMO (48, see below): PWM output. Connected to the output of PWM2 module.
AGND (63 = GND, static): Ground for all analog circuitry (except power bridge).
VCC (64 = 5V, static): Output. 5V power supply for analog circuits, from internal voltage regulator.
I had placed the actuator so that on the right side i had the outer connector with the 5 pins and the power supply filter capacitor (big blue one), that way the MCU is also the same layout as depicted in Fig. 2 (pinout) of the datasheet.
OUTL, OUTR: connected to the motor terminals, where the poles are rising up along the wall of the black actuator plastic housing, with both being at the same static voltage level; level is the same from the MCU pins to the motor pins. When looking at it from top, the left motor terminal goes to OUTR and the right one to OUTL.
PWMI, PWMO: (imho) strange things happening here. They are somehow connected to the signal to Pin 4 (PWM) of the external actuator connector. With Pin 4 open, both go to 12V, and every 3 seconds there is a short grounding pulse. I guess that is what the Hella guy was referring to when he said there is a grounding pulse on error condition. This same signal can also be measured on the external Pin 4 when open.
For testing i also applied 5V to Pin 4 and noticed that the voltage would be static 5V at PWMI and PWMO. When disconnecting the 5V, it would go to 12V again, with the 0.33Hz GND pulse; but the PWMI would drop to 0 first and then apply 12V, whereas the PWMO went to 12V instantly. So somehow it seems PWMO is set up for mirroring or copying this signal?
The (TS?)SOP16 packaged 16 pin IC next to the inductive rotary position sensor field coil is used for just that (position sensing), but seems it's also some proprietary IC. Maybe PWMI/O is related to that one to determine rotor position? Haven't checked if there are common pins or something..
Something more to note.. Since I had the top of the actuator (motor, gearing, CIPOS rotor indicating the position) taken off, maybe there was an error condition present since the position of the actuator could not be determined.
Well long story short.. So far I haven't had any luck with getting my actuator to rotate except when i apply voltage straight to the motor terminals. Any input on the signalling parameters for the PWM on Pin 4 i have to feed in for commanding the position? I might look into rigging up that open collector stuff although i'm not sure how this would help.
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