3.4 Interfacing the MSP430 on the EVM to an AFE4500 on a Different Board
To interface the MSP430 on EVM using the I2C interface with AFE4500 on a different board, do the following
changes:
• Remove all shunts on J1 connector.
• Connect the signals from the AFE4500 on a different board to the EVM as shown in Table 3-1
Table 3-1. Signal from AFE4500 on another Board
Signal from external module Connections on AFE4500EVM
I2C_CLK J1-AFE_CLK_1
I2C_DAT J1-AFE_SDIN_1
ADC_RDY J1-AFE_ADC_RDY_1
RESETZ J1- AFE_RESET_1
CLK J1- AFE_CLK_1
LDO_BYP J1- AFE_LDO_BYP_1
• Share the GND signal between the module and EVM. Ensure that the supplies on the external AFE4500 and
the EVM are matched, or tap them from the EVM
Figure 3-3. Test points
3.5 To Interface an MCU on a Different Board with the AFE of EVM
To interface an MCU on a different board with the AFE of EVM in I2C interface:
• Connect the signals from external MCU to the EVM as shown in Table 4. Before connecting the signals, make
sure the shunts placed on J1 to connect the signals between AFE4500 and MCU is removed.
Table 3-2. Signal Mapping
S. No Signal Description
I2C_CLK J1-AFE_CLK I2C_CLK
I2C_DAT J1-AFE_SDIN I2C_DAT
ADC_RDY J1-AFE_ADC_RDY ADC_RDY
RESETZ J1- AFE_RESET RESETZ
CLK J1- AFE_CLK CLK
LDO_BYP J1- AFE_LDO_BYP LDO_BYP
• Share the GND signal between the module and EVM
AFE4500 EVM Hardware
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18 AFE4500 EVM User Guide SBAU370 – APRIL 2021
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