MAX-M10S-Integration manual
Avoid high resistance on the V_BCKP line. During the switch to V_BCKP supply, a short
current adjustment peak may cause a high voltage drop at the pin.
If the hardware backup mode is not used, leave the V_BCKP pin open.
3.1.4 Supply design examples
The two voltage ranges for VCC and V_IO allow three combinations when designing the receiver
power supply. Depending on the chosen combination, there are certain requirements to be
considered. These are summarized in Table 29.
Option Nominal supply (V) Design case / Requirements
V_IO VCC
1 3.3 3.3
3.3 V design where VCC and V_IO are connected together. See Figure 21 for designs
using the hardware backup mode, and Figure 22 for designs without backup supply.
• VIO_SEL pin left open.
• Voltage at VCC_RF pin = VCC - 0.1 V.
2 1.8 1.8
1.8 V design with VCC and V_IO connected together. This design requires an accurate
supply. See Figure 21 for designs using the hardware backup mode, and Figure 22 for
designs without backup supply.
• VIO_SEL is grounded.
• Note that the voltage output at VCC_RF = VCC - 0.1 V.
• Note that the maximum supply tolerance is 1.8 V ± 2 %.
To enter hardware backup mode, set the receiver to software standby mode
with the UBX-RXM-PMREQ message before switching off V_IO and VCC.
3 1.8 1.8 / 3.3
VCC and V_IO are supplied independently. V_IO is supplied with an accurate 1.8 V
supply. VCC can be either supplied with 1.8 V or 3.3 V. See Figure 23 for designs using
the hardware backup mode, and Figure 24 for designs without backup supply.
• VIO_SEL pin is grounded.
• Note that the maximum supply tolerance is 1.8 V ± 2 %.
• Voltage at VCC_RF pin = VCC - 0.1 V.
To enter hardware backup mode, switch off V_IO 100 ms before VCC.
Alternatively, the receiver can be set to software standby mode with the
UBX-RXM-PMREQ message before switching off V_IO and VCC.
Table 29: Voltage supply options
Figure 21: VCC and V_IO connected to the main supply, and external power supply at V_BCKP.
Figure 22: VCC and V_IO connected to the main supply. No external power supply at V_BCKP.
UBX-20053088 - R03
3 Hardware integration Page 63 of 89
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