Re: FreeRunner Navigation Board v3 - Power management
Hi, 2011/5/21 Christoph Mair m...@chonyota.net: Hi, Am Samstag 21 Mai 2011, 16:41:06 schrieb Martix: How much of power Navigation Board v3 consume, both in operational state (all sensors are active) and in idle state (all sensors are powered down)? Can I power down whole board from software? All sensors support a sleep state which reduces power consumption fo a few µA. I will add exact numbers to the wiki page. The sleep state is activated automatically after power-on. Therefore you have to talk to the sensor to activate it. The only exception is the gyroscope ITG-3200. This sensor needs the kernel module which will switch it of immediately after the module was loaded. If you forget to do this, it will consume about 6mA, IIRC. could be board VCC connected somehow to the PMU (PCF50633)? Perhaps, Navigation Board could use free power line from PMU, if it's available or share power line with one accelerometer or GPS. I don't know much about the PMU, but I tried to connect the board to one accelerometers VCC pin. It works, but I would not recommend it, because the I2C lines are pulled up when idle. If the chips do not get powered, some current may flows from the bus lines to ground. This could be more that the normal standby current. But I have to admit that I did not thest this yet. Ok, I understand, current can leak through accerometer to GND. But, this can also happen with VCC connected to AUX, when AUX LED is on. This could be explanation for NOR u-boot problem. http://wiki.openmoko.org/wiki/I2C#Powering_additional_I2C_devices According to http://wiki.openmoko.org/wiki/Freerunner_Navigation_Board#Installation the AUX power is disabled in suspend. Is this PMU behavior configurable from software? For example, if I want to wake up Neo FreeRunner from suspend by IRQ interrupt from Navigation Board. I know about test pins with 0R resitors on PMU power outputs used for external current measurement, VCC could be provided from one of these pads. I'd like to hear more about these 0Rs.. These pins could by used for current measurement (for example replace 0R by 0.1R and measure voltage drop on it) or for powering peripheral devices from external sources. For practical use see: http://ertos.nicta.com.au/publications/papers/Carroll_Heiser_10.pdf Did anybody considered PMU power management approach with Navigation Board? It should not be needed and could even be a bad idea. See above. Fortunately, I've found free PMU power output LDO3OUT alias test pin H-TP1702, which is proper solution for powering expansion devices/board like this. On the other hand its not easily accessible as AUX button or accelerometer, because its located near PMU under EM shielding, but its not impossible to wire it out. (Please, keep this in mind during GTA04 design process and wire at least one 3V3 power line outside shielding.) PS: It would be nice to have some informations regarding power management documented on the wiki: http://wiki.openmoko.org/wiki/Freerunner_Navigation_Board_v3 I will add some more info. The wiki page lacks a few other updates too.. pinout and new pictures, for example.. I will try to fix this tomorrow. Best Regards, Christoph Best Regards, Martix ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: FreeRunner Navigation Board v3 - Power management
Am Sonntag 22 Mai 2011, 11:44:24 schrieben Sie: Hi, 2011/5/21 Christoph Mair m...@chonyota.net: Hi, Am Samstag 21 Mai 2011, 16:41:06 schrieb Martix: How much of power Navigation Board v3 consume, both in operational state (all sensors are active) and in idle state (all sensors are powered down)? Can I power down whole board from software? All sensors support a sleep state which reduces power consumption fo a few µA. I will add exact numbers to the wiki page. The sleep state is activated automatically after power-on. Therefore you have to talk to the sensor to activate it. The only exception is the gyroscope ITG-3200. This sensor needs the kernel module which will switch it of immediately after the module was loaded. If you forget to do this, it will consume about 6mA, IIRC. See http://wiki.openmoko.org/wiki/Freerunner_Navigation_Board_v3#Power_consumption could be board VCC connected somehow to the PMU (PCF50633)? Perhaps, Navigation Board could use free power line from PMU, if it's available or share power line with one accelerometer or GPS. I don't know much about the PMU, but I tried to connect the board to one accelerometers VCC pin. It works, but I would not recommend it, because the I2C lines are pulled up when idle. If the chips do not get powered, some current may flows from the bus lines to ground. This could be more that the normal standby current. But I have to admit that I did not thest this yet. Ok, I understand, current can leak through accerometer to GND. But, this can also happen with VCC connected to AUX, when AUX LED is on. This could be explanation for NOR u-boot problem. http://wiki.openmoko.org/wiki/I2C#Powering_additional_I2C_devices I mostly use power from the AUX switch. With the FRNBv3 I did not encounter the NOR u-boot problem yet. Everything seems to work fine. If someone encounters a problem, there are solderpads for additional capacitors on the bottom side to fix evantual issues. According to http://wiki.openmoko.org/wiki/Freerunner_Navigation_Board#Installation the AUX power is disabled in suspend. Is this PMU behavior configurable from software? For example, if I want to wake up Neo FreeRunner from suspend by IRQ interrupt from Navigation Board. You got that wrong. The AUX power is always available, just the power to the accelorometers is shut down in suspend. If you grab your VCC from the decoupling cap of the accel, all sensors will be switched off. If you want to weak the FR using a IRQ triggered from the FRNB, you need an additional wire to connect one sensor to a IRQ line on the FR. Since v3, all interrupt outputs of the sensors are available on (tiny) testpoints. Fortunately, I've found free PMU power output LDO3OUT alias test pin H-TP1702, which is proper solution for powering expansion devices/board like this. On the other hand its not easily accessible as AUX button or accelerometer, because its located near PMU under EM shielding, but its not impossible to wire it out. I did not try this yet. (Please, keep this in mind during GTA04 design process and wire at least one 3V3 power line outside shielding.) Depending on measurement results, we may do not need a shield and there are testpoints which you can use to power additional electronics. PS: It would be nice to have some informations regarding power management documented on the wiki: http://wiki.openmoko.org/wiki/Freerunner_Navigation_Board_v3 I will add more information when I can test the first machine assembled board. Best regards, Christoph ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
FreeRunner Navigation Board v3 - Power management
Hello, How much of power Navigation Board v3 consume, both in operational state (all sensors are active) and in idle state (all sensors are powered down)? Can I power down whole board from software? If not, could be board VCC connected somehow to the PMU (PCF50633)? Perhaps, Navigation Board could use free power line from PMU, if it's available or share power line with one accelerometer or GPS. I know about test pins with 0R resitors on PMU power outputs used for external current measurement, VCC could be provided from one of these pads. Did anybody considered PMU power management approach with Navigation Board? I like to hear your opinion and suggestions about this matter. PS: It would be nice to have some informations regarding power management documented on the wiki: http://wiki.openmoko.org/wiki/Freerunner_Navigation_Board_v3 Best Regards, Martix ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
Re: FreeRunner Navigation Board v3 - Power management
Hi, Am Samstag 21 Mai 2011, 16:41:06 schrieb Martix: How much of power Navigation Board v3 consume, both in operational state (all sensors are active) and in idle state (all sensors are powered down)? Can I power down whole board from software? All sensors support a sleep state which reduces power consumption fo a few µA. I will add exact numbers to the wiki page. The sleep state is activated automatically after power-on. Therefore you have to talk to the sensor to activate it. The only exception is the gyroscope ITG-3200. This sensor needs the kernel module which will switch it of immediately after the module was loaded. If you forget to do this, it will consume about 6mA, IIRC. could be board VCC connected somehow to the PMU (PCF50633)? Perhaps, Navigation Board could use free power line from PMU, if it's available or share power line with one accelerometer or GPS. I don't know much about the PMU, but I tried to connect the board to one accelerometers VCC pin. It works, but I would not recommend it, because the I2C lines are pulled up when idle. If the chips do not get powered, some current may flows from the bus lines to ground. This could be more that the normal standby current. But I have to admit that I did not thest this yet. I know about test pins with 0R resitors on PMU power outputs used for external current measurement, VCC could be provided from one of these pads. I'd like to hear more about these 0Rs.. Did anybody considered PMU power management approach with Navigation Board? It should not be needed and could even be a bad idea. See above. PS: It would be nice to have some informations regarding power management documented on the wiki: http://wiki.openmoko.org/wiki/Freerunner_Navigation_Board_v3 I will add some more info. The wiki page lacks a few other updates too.. pinout and new pictures, for example.. I will try to fix this tomorrow. Best Regards, Christoph ___ Openmoko community mailing list community@lists.openmoko.org http://lists.openmoko.org/mailman/listinfo/community
