Texas Instruments AFE4490 Evaluation Module AFE4490SPO2EVM AFE4490SPO2EVM Benutzerhandbuch
Produktcode
AFE4490SPO2EVM
AFE44x0SPO2EVM Hardware
5.1
Power Supply
AFE4490 can operate from 2.0- to 3.6-V Rx analog supply (RX_ANA_SUP), 2.0- to 3.6-V Rx digital supply
(RX_DIG_SUP), 3.0- to 5.25-V Tx Control supply (TX_CTRL_SUP) and LED driver supply
(LED_DRV_SUP).
(RX_DIG_SUP), 3.0- to 5.25-V Tx Control supply (TX_CTRL_SUP) and LED driver supply
(LED_DRV_SUP).
AFE4400 can operate from 2.0- to 3.6-V Rx analog supply (RX_ANA_SUP), 2.0- to 3.6-V Rx digital supply
(RX_DIG_SUP), 3.0- to 3.6-V Tx Control supply (TX_CTRL_SUP) and LED driver supply
(LED_DRV_SUP).
(RX_DIG_SUP), 3.0- to 3.6-V Tx Control supply (TX_CTRL_SUP) and LED driver supply
(LED_DRV_SUP).
The power for the board is derived from the USB input (J4) through a forward-biased diode (D5) to avoid
reverse current flow. The USB data bus is ESD protected using TI’s ESD protection diode array
TPD4E004DRYR (U7). The USB VBUS is fed to the integrated Li-ion linear charger and system power-
path management module, BQ24032ARHLR (U12), which generates greater than 4.2-V output
(VCC_BAT). This output is fed to TI’s low-input boost converter with integrated power diode and
input/output isolation, TPS61093 (U9), for generating a boosted voltage of 8.97 V. This output is fed to
low-noise voltage regulator LP3878-ADJ (U8) for generating 5 V for the LED_DRV_SUP and
TX_CTRL_SUP for AFE4490 EVM and for generating 3.3 V for the LED_DRV_SUP and TX_CTRL_SUP
for AFE4400 EVM. The boost converter output is also fed to the ultralow-noise linear voltage regulator
TPS7A4901DGN (U13) for generating 3 V for the RX_ANA_SUP and RX_DIG_SUP. The boost converter
output is also fed to the ultralow-noise linear voltage regulator TPS7A4901DGN (U14) for generating 3 V
for MSP_DVCC and MSP_AVCC.
reverse current flow. The USB data bus is ESD protected using TI’s ESD protection diode array
TPD4E004DRYR (U7). The USB VBUS is fed to the integrated Li-ion linear charger and system power-
path management module, BQ24032ARHLR (U12), which generates greater than 4.2-V output
(VCC_BAT). This output is fed to TI’s low-input boost converter with integrated power diode and
input/output isolation, TPS61093 (U9), for generating a boosted voltage of 8.97 V. This output is fed to
low-noise voltage regulator LP3878-ADJ (U8) for generating 5 V for the LED_DRV_SUP and
TX_CTRL_SUP for AFE4490 EVM and for generating 3.3 V for the LED_DRV_SUP and TX_CTRL_SUP
for AFE4400 EVM. The boost converter output is also fed to the ultralow-noise linear voltage regulator
TPS7A4901DGN (U13) for generating 3 V for the RX_ANA_SUP and RX_DIG_SUP. The boost converter
output is also fed to the ultralow-noise linear voltage regulator TPS7A4901DGN (U14) for generating 3 V
for MSP_DVCC and MSP_AVCC.
The inductors L2, L2, L4, and L5 are used to minimize the power supply noise induced by the power
supply regulators.
supply regulators.
Test point and series jumper resistors are provided to make sure the power supplies to the board are
correct. The corresponding voltages on AFE4490SPO2EVM are given in
correct. The corresponding voltages on AFE4490SPO2EVM are given in
. The corresponding
voltages on AFE4400SPO2EVM are shown in
.
Table 2. Test Points for Measuring Voltages on the AFE4490SPO2EVM
S. No.
Test Point
Description
1
TP36
5 V
2
L6, pin # 2 (R76)
5 V
3
L5, pin # 2 (R65)
5 V
4
L1, pin # 2 (R55)
3 V
5
L2, pin # 2 (R54)
3 V
6
L3, pin # 2
3 V
Table 3. Test Points for Measuring Voltages on the AFE4400SPO2EVM
S. No.
Test Point
Description
1
TP36
5 V
2
L6, pin # 2 (R76)
3.3 V
3
L5, pin # 2 (R65)
3.3 V
4
L1, pin # 2 (R55)
3 V
5
L2, pin # 2 (R54)
3 V
6
L3, pin # 2
3 V
5.2
Clock
The EVM has the option to use the on-board 8-MHz crystal or the clock for the AFE44x0 from the
MSP430. The EVM is shipped to use the on-board 8-MHz crystal. The 4-MHz buffered output clock from
the AFE44x0 can be accessed through the series jumper resistor, R23.
MSP430. The EVM is shipped to use the on-board 8-MHz crystal. The 4-MHz buffered output clock from
the AFE44x0 can be accessed through the series jumper resistor, R23.
29
SLAU480C – January 2013 – Revised May 2014
AFE4400 and AFE4490 Development Guide
Copyright © 2013–2014, Texas Instruments Incorporated