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5.2 Jumpers
Table 2. Jumpers
JUMPER
FUNCTION PLACEMENT COMMENT
NO.
For sequencing do not fit jumper.
JP15 BUCK1 enable (EN1) Fit according to test requirement
To disable converter fit jumper to GND.
For sequencing do not fit jumper.
JP6 BUCK2 enable (EN2) Fit according to test requirement
To disable converter fit jumper to GND.
Low power: Power save mode ON/OFF. Fit according to test requirement.
JP20 LOW_P If need low power mode test, should connect During normal operation jumper must
V3V. be fitted.
Pulls PGOOD signal to internal 3V3 rail or
JP24 PGOOD Fit according to test requirement
grounds pin
Enables power switch when tied to 3v3.
JP25 USB_EN Fit according to test requirement
Disables power switch when tied to GND.
When fitted connects USB switch alarm to
JP26 USB_nILIM Fit according to test requirement
internal 3V3 rail
5.3 Test Points and Placement
Buck converter outputs are white and have a label for easy location. Close to any of these test points
there are black ground test points to allow for DVM measurement or to use a metal exposed scope probe
to reduce common mode noise measurements. All test points are described in Table 3.
Table 3. Test Points and Placement
TEST
NAME SIGNAL COLOR COMMENT
POINT
TP1, TPS, TP3,
GND Ground Black
TP4, TP5
TP8 VIN Input supply White
TP9, TP9A VOUT1 Buck1 output White
TP9B Input for gain-phase measurement Buck1 White Normally not used
TP11, TP11A VOUT2 Buck2 output White
TP11B Input for gain-phase measurement Buck2 White Normally not used
TP20 LowP Low Power input White
TP23 rUSB USB switch current set pin White
Power Good
TP24 PGOOD White
(open drain connected to Buck1 output)
TP25 USB_EN Enable pin for USB swtich White
TP26 USB_nILIM USB switch alarm pin White
TP27 USB_VIN USB switch input White
TP28 USB_Vo USB switch output White
11
SLVU438–January 2011 List of Tables
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