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title	Power supply options diagram

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1.2 V, 2.5 V and 3.3 V voltage rails are provided by corresponding step-down regulator DC/DC converters, each one capable of providing up to 3 A of output current. These three regulators are synchronized to switch with 120° phase lag, to improve EMC, and to reduce input ripple. The synchronization circuit can be omitted in cost sensitive applications (please contact Trenz Electronic).
Power supply inputs and outputs are made available at B2B connectors JM4 and JM5 for user applications.

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title	On-board power rails summary.

power-rail name	nominal voltage (V)	maximum current (A)	power source	system supply	user supply
Vb2b	4.0 to 7.0	4.0 (4 pin × 1.0 ^A/_pin)	JM5	module	-
Vusb	5.0	0.5	J1	module	-
Vsup	4.0 to 7.0	< 0.5	Vusb	3 × DC/DC DC/DC sync power-fail	JM5 (≤1.0 A)
Vsup	4.0 to 7.0	< 4	Vb2b	3 × DC/DC DC/DC sync power-fail	JM5 (≤1.0 A)
3.3V	3.3	3.0	Vsup

â-º

â–º DC/DC

module

JM4 (≤1.0 A)

JM5 (≤1.0 A)

2.5V

2.5

3.0

Vsup

â-º

â–º DC/DC	DDR SDRAM	JM5 (≤1.0 A)
1.2V	1.2	3.0	Vsup

â-º

â–º DC/DC	VCCINT	JM5 (≤1.0 A)
VCCAUX	2.5	0.3	3.3V

â-º

â–º LDO	VCCAUX	JM4 (≤1.0 A)
3.3	VCCAUX	JM4 (≤1.0 A)	< 3.0	3.3V
VCCCIO0	2.5	< 3.0	2.5V	VCCO (bank 0)	JM4 (≤1.0 A)
	3.3	< 3.0	3.3V		JM4 (≤1.0 A)
	1.10 to 3.60	2.0 (2 pin × 1.0 A/pin)	JM4 (30 + 44)		JM4 (30 / 44)

If resistors R9 and R11 are populated and R12 is not populated, then TE0320 is power supplied through JM5 (B2B connector).

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title	Assembly combination for power supply through JM5.

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If resistors R9 and R11 are not populated and R12 is populated, then TE0320 is power supplied through J1 (USB bus).

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title	Assembly combination for power supply through J1.

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Warning
Any other assembly combination of R9, R11 and R12 is not allowed.

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1. if inductor L2 is not populated and the low-noise low drop-out regulator U6 is populated, VCCAUX power rail is supplied with its nominal voltage of 2.5 V. This is the recommended option for noise-sensitive circuitry such as clocking and timing infrastructures.
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  title Assembly option for VCCAUX = 2.5 V (bottom view).
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2. if the ferrite bead L2 is populated and U6 is not populated, the 3.3V power rail is simply filtered to generate VCCAUX power rail. This is the recommended option for cost-sensitive applications. In this case

- ensure the noise level on power rail VCCUAX is suitable to your application;
- avoid the connection of noise sources to power rail VCCUAX.
  
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  title Assembly option for VCCAUX = 3.3 V (bottom view).
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  Warning
  Any other assembly combination of L2 and U6 is not allowed.

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1. if resistor R131 is not populated and R132 is populated, VCCCIO0 power rail is set to power rail 2.5V (nominal voltage = 2.5 V).
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  title Assembly option for VCCIO0= 2.5 V (bottom view).
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  Note
  Pins 30 and 44 of JM4 are power supply inputs in this case.
2. if resistor R131 is populated and R132 is not populated, VCCCIO0 power rail is set to power rail 3.3V (nominal voltage = 3.3 V). This is the default.
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  title Assembly option for VCCCIO0 = 3.3 V (bottom view).
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  Note
  Pins 30 and 44 of JM4 are power supply outputs in this case.
3. if both resistors R131 and R132 are not populated, VCCCIO0 power can be supplied through pins 30 and 44 of B2B connector JM4.
  
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  title Assembly option for VCCAUX = off (bottom view)
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  Note
  Pins 30 and 44 of JM4 are power supply outputs in this case.
  
  Warning
  Assembly option where both R131 and R132 are populated is not allowed.