STMicroelectronics STEVAL-GLA001V1, Руководство пользователя

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Figure 11. STEVAL-GLA001V1 evaluation board LED components
If the LEDx signal is set to 0 (GND), the chosen LED is OFF; if the LEDx signal is set to 5 V, 3.3 V or VDD, the
chosen LED is illuminated.
“LED1”, “LED2”, “LED3”, “LED4” and “GND” test points are available to measure led voltage level.
2.5.6 Switch mode
The mode selector switch signal is available on J202 (user board) and J203 ( NUCLEO-F030R8 development
board) connectors. It is referenced with respect to VDD and GND (refer to Section 2.5.3 VDD selector ).
Figure 12. STEVAL-GLA001V1 evaluation board mode components
The switch has 3 ON positions, so there is a non-zero voltage on the MODE signal in any position. The following
table shows MODE signal voltage with respect to the switch position.
Table 2. MODE signal voltage versus switch position
MODE switch position
(board silkscreen)
MODE voltage
MODE voltage with VDD =
3.3 V
MODE voltage with VDD = 5
V
On/Off VDD ÷ 1.62 2.04 V 3.09 V
Phase control VDD ÷ 2.62 1.26 V 1.91 V
Timer VDD ÷ 2 1.65 V 2.5 V
“MODE” and “GND” test points are available to measure switch mode voltage level.
UM2304
Hardware function description
UM2304 - Rev 3
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