Datasheet

AFE44x0SPO2EVM Hardware

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5.3 Accessing AFE44x0 Digital Signals

AFE44x0 SPI interface and other digital signals with MSP430 can be accessed through the series resistor

jumpers given in Table 4.

Table 4. AFE44x0 Digital Signals

S. No. Signal Jumper Resistor

1 STE R29

2 SIMO R31

3 SOMI R33

4 SCLK R35

5 ADC_RDY R26

6 PD_ALM R37

7 LED_ALM R39

8 DIAG_END R38

9 AFE_PDNZ R42

5.4 Analog Inputs

The AFE44x0SPO2EVM gives the user the option to feed in the pulse oximeter simulator signals to the

DB9 connector (J2).

For all measurements in this user guide, the ProSim Fluke SPOT Light SpO2 Functional tester was used

as shown in Figure 30.

Figure 30. Fluke SPOT Light SpO2 Functional Tester Setup

5.5 USB Interface

The EVM has a mini USB interface for PC application connectivity requiring a standard mini USB to USB

cable for connection. AFE44x0SPO2EVM is designed to work in the slave mode.

5.6 On-board Key Interface

The EVM has 2 switches. The function of each switch is defined in Table 5

Table 5. AFE44x0SPO2EVM Switches

Switch Number Description

SW1 This switch is used for hard reset of the board. The board resets and starts again with the firmware loaded.

SW2 This switch is used to enable boot strap loader (BSL) MSP430 firmware.

AFE4400 and AFE4490 Development Guide SLAU480A–January 2013–Revised February 2013

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