Latest revision as of 19:48, 4 June 2015

Validation Matrix

Validation matrix
Subsystem	basic status	extended status	notes
Kinetis-W CPU	OK		basic SWIO functions OK, OS operational
WS2812B driver	OK		confirmed CPU has GPIO performance to operate on-board LEDs; extended chain testing TBD
I2C	OK	OK
SPI	OK	OK
OLED	OK
UART	OK		Works well enough for chibiOS
Integrated radio	OK
BLE	OK
Accelerometer	OK
Microphone	ECO1 / OK	OK	Schematic symbol mirrored; requires board respin. Tested OK on EVT1b
MPR121	OK	OK
Jog dial + buttons	OK	OK
GPIO expander	OK	OK
Fancy battery charger	OK	OK
Shipping state power	OK	OK	immeasurable leakage when in "ship mode" e.g. soft battery disconnect state
Gas gauge	OK/ECO3	OK	gas gauge itself works fine, talks on I2C; but topological position is incorrect and requires ECO3 to be effective
USB charging port	OK
USB charging port OC protect
Cheesy battery charger option	N/A		not populated in EVT1
Cheesy battery level option	N/A		not populated in EVT1
On-state power characterization	OK
Standby power characterization	OK

As measured while on battery, ~3.9V through test. ~27 degrees C ambient temperature, 70% RH

Alt-order:

Ship mode:

No difference when hibernation instruction is given to gas gauge.

Conclusions:

VLLS0 stop on Cortex-M0+ should be around 0.0003mA
So, there is about 0.5mA leakage in the system. This is probably about right, given that the accelerometer, captouch, BLE are still powered up but simply in standby, and also the LDO will have some draw as well. My guess is that if there is stray resistance it's accounting for < 50% of the current leakage budget.

With 1200mAh battery:

With 4000mAh battery:

16 LEDs on a modest pattern - 47 hours (~2 days)
LEDs off, but OLED, BLE on: 100 hours (~4 days)
VLLS0 sleep: 6,500 hours (9 months) -- this is about self-discharge rate anyways, so probably half this duration
Ship mode: 30,000 hours (~3.8 years) -- in reality, self-discharge is faster than this.

@@ Line 56: / Line 56: @@
 =Power Consumption=
-As measured while on battery, ~3.9V through test.
+As measured while on battery, ~3.9V through test. ~27 degrees C ambient temperature, 70% RH
 * Powered on, 16 LEDs running wave-rainbow at default brightness: 78-79mA
@@ Line 92: / Line 92: @@
 No difference when hibernation instruction is given to gas gauge.
+Conclusions:
+* VLLS0 stop on Cortex-M0+ should be around 0.0003mA
+* So, there is about 0.5mA leakage in the system. This is probably about right, given that the accelerometer, captouch, BLE are still powered up but simply in standby, and also the LDO will have some draw as well. My guess is that if there is stray resistance it's accounting for < 50% of the current leakage budget.
 ==Battery life estimates==