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Test Set Up

Table 9. Control Signals (continued)

J20 PWRHOLD If PWRHOLD is low then the device will

not power-up. So, connect this to HI side

of the jumper. See important description

below.

J13 SDASR_EN2 Both these signals can be used to control

the LDO and SMPS power supplies.

J14 SCLSR_EN1

Please refer details on programming the

internal register to achieve this function.

If USB-to-GPIO connector is connected on J1 or J2 then the above signals can be controlled using the

GPIO writes from the GUI. In this case the above jumpers should not be connected. Jumpers should be

left open. In case of SLEEP and GPIO signals there will be contention for VDDIO supply. In case of

PWRHOLD, the device will be damaged. This is because the PWRHOLD signal from USB-to-GPIO is at

3.3V. The HI side of J20 jumper is connected to VRRTC. If VRRTC is shorted to 3.3V then this will

damage the device. When the adapter is connected all IOs should be at 3.3V, so ensure J11 is connected

between VDDIO and 3.3V.

4.2 Test Point Descriptions

Table 10. Test Point Descriptions

Power Domain/Control TP Label Use

VIO J39 VIO_OUT Monitor VIO output voltage

VDD1 J35 VDD1 Monitor VDD1 output voltage

VDD2 J37 VDD2 Monitor VDD2 output voltage

VDD3 J33 VDD3 Monitor VDD3 output voltage

VPLL J25 VPLL Monitor VPLL output voltage

VDAC J24 VDAC Monitor VDAC output voltage

VAUX1 J26 VAUX1 Monitor VAUX1 output voltage

VAUX2 J27 VAUX2 Monitor VAUX2 output voltage

VMMC J28 VMMC Monitor VMMC output voltage

VAUX33 J29 VAUX33 Monitor VAUX33 output voltage

VDIG1 J30 VDIG1 Monitor VDIG1 output voltage

VDIG2 J31 VDIG2 Monitor VDIG2 output voltage

VREF J15 VREF Monitor VREF output voltage

VRRTC J23 VRRTC Monitor VRRTC output voltage

PWRHOLD J20-2 PWRHOLD Monitor PWRHOLD level

PWON S1 POWER ON Power-on switch

SLEEP J19-2 SLEEP Control device status

GPIO/CKSYN J18-2 GPIO/CKSYNC GPIO test point

NRESPWRON TP5 NRESPWON Reset to processor

INT1 TP4 INT1 Interrupt to processor

CLK32KOUT TP6 CLK32KOUT 32KHz to processor

Use J32 for all GND connections for measuring the LDO power supplies. J34, J36, J38, and J40 can be

used for ground connections for measuring DCDC power supplies.

5 Test Set Up

5.1 Equipment

Recommended test equipments:

• Variable 6-V power supply capable of supplying 6 A current

SWCU065F–March 2010–Revised April 2013 Introduction

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