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User's Guide

SNVU189A–October 2012–Revised May 2013

AN-2298 LM8335 Evaluation Module (EVM)

1 Introduction

The Texas Instruments LM8335EVM evaluation module (EVM), Figure 1, helps designers evaluate the

operation and performance of the LM8335 MIPI RFFE to General Purpose Output (GPO) Expander. The

EVM contains a USB to MIPI RFFE convertor (MSP430F5510), three LDOs, a 74LVC8T245 buffer for

self-test, and the LM8335 (see Table 1).

Table 1. Device and Package Configurations

Converter IC Package

U1 LM8335 DSBGA-16

U2 MSP430F5510 48VQFN

U3 74LVC8T245PWRE4 PW024

U4 LP2980AIM5-3.3/NOPB SOT23

U5 LP5990

DSBGA-4

U6 LP5990

Figure 1. LM8335EVM

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SNVU189A–October 2012–Revised May 2013 AN-2298 LM8335 Evaluation Module (EVM)

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Summary of content (13 pages)

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User's Guide SNVU189A – October 2012 – Revised May 2013 AN-2298 LM8335 Evaluation Module (EVM) 1 Introduction The Texas Instruments LM8335EVM evaluation module (EVM), Figure 1, helps designers evaluate the operation and performance of the LM8335 MIPI RFFE to General Purpose Output (GPO) Expander. The EVM contains a USB to MIPI RFFE convertor (MSP430F5510), three LDOs, a 74LVC8T245 buffer for self-test, and the LM8335 (see Table 1). Table 1.
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LM8335 EVM Setup 2 www.ti.com LM8335 EVM Setup This section describes the jumpers and connectors on the EVM as well and how to properly connect, set up and test the LM8335EVM Evaluation Board. 2.1 Input/Output Connector Description • • • • J1 – Input is the USB input connector. This connector provides USB data communication, 5V Power In, and ground (GND) connection. J2 – Input/Output is the MIPI RFFE input/output and GPO output connector.
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LM8335 GUI www.ti.com 5 LM8335 GUI The LM8335EVM GUI will initially start with all access disabled with the exception of the Open button (refer to Figure 3). Clicking this button will initialize the USB interface between the PC and the LM8335EVM. When the USB connection is successfully opened the Serial: and Firmware Revision: fields will be populated with the LM8335EVM values (refer to Figure 4).
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LM8335 GUI www.ti.com Figure 4.
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LM8335 GUI www.ti.com Figure 5.
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LM8335 GUI www.ti.com The LM8335EVM GUI provides user access and LM8335 self-test access. 5.1 User Access Tab The User Access tab (refer to Figure 4) is partitioned into 4 sections: 1. Control Access: this section establishes USB communication to the LM8335EVM. 2. VIO Control: this section is used set the LM8335 ADR and CFG pin starts, turn VIO on, turn VIO off, pulse VIO and provides the VIO and 1.8V status indicators. 3. LM8335 Register Access: this section is used to access the LM8335 registers 4).
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LM8335 GUI www.ti.com 5.2 Test Access Tab The Test Access tab (refer to Figure 6) is partitioned into 2 sections: 1. LM8335 GPO Readback: this section is used to verify the LM8335 GPO outputs. Clicking the Read GPO button will perform a walking one test of the LM8335 GPOs. The test starts with the value of 1 (GPO0) and advances to 80 (GPO7). The test will wrap from 80 back to 1 and can be repeated indefinitely by continuing to click the Read GPO button. 2.
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LM8335 EVM Layout 6 www.ti.com LM8335 EVM Layout Figure 7.
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LM8335 EVM Layout www.ti.com Figure 8.
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LM8335 EVM Layout www.ti.com Figure 9.
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LM8335 Bill of Materials www.ti.com 7 LM8335 Bill of Materials Qty Designator Description Part Number 2 C1, C5 CAP, CERM, 20 pF, 50V, ±5%, C0G/NP0, 0603 GRM1885C1H200JA01D 603 1 C2 CAP, CERM, 0.22 µF, 25V, ±10%, X5R, 0603 06033D224KAT2A 603 2 C3, C4 CAP, CERM, 0.4 7µF, 16V, ±10%, X7R, 0603 C0603C474K4RACTU 603 2 C6, C7 CAP, CERM, 10 pF, 50V, ±5%, C0G/NP0, 0603 06035A100JAT2A 603 1 C8 CAP, CERM, 4.7 µF, 10V, ±10%, X5R, 0603 C0603C475K8PACTU 603 1 C9 CAP, CERM, 2.
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LM8335 EVM Schematic 8 www.ti.com LM8335 EVM Schematic Figure 10.
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