AN4494 datasheet(8/34 Pages) STMICROELECTRONICS

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Application PCB test points

AN4494

Application PCB test points

ST recommends making available a set of test points in order to measure the performance

of the device on the customer PCB. Depending on customer PCB constraints, it may not

always be possible to add all test points, in which case some tests cannot be performed.

Table 1: Test points

Test point

Function

Details of the test point

Current

consumption

Should be added in the PCB to

measure BlueNRG current

consumption.

In series with the VBAT1,2,3

pins.

Voltage supply

Should be added to measure BlueNRG

supply voltages.

To pins:

VDD1V8, VDD1V2

SMPSFILT1, SMPSFILT2

If the PCB uses an embedded antenna,

like a PCB or a chip antenna, it is

recommended to add a UFL connector

to allow measurement of the RF

performance with a spectrum analyzer.

Between the matching network

(or balun) and the embedded

antenna (see Figure 1: "UFL

connector").

SPI

Customer PCB should allow exclusion

of its own microcontroller and allow

connection of the BlueNRG SPI lines to

the STEVAL-IDB002V1 motherboard.

If the SPI test point is not available,

ST can provide the GUI firmware

required to port it on the customer

microcontroller.

This assumes that the customer PCB

has a USB or RS232 I/O port available

for PC connection.

Between the microcontroller and

the BlueNRG.

TEST8, TEST9

Pins used for the XTAL_startup

measure

Pins: TEST8, TEST9

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