STMicroelectronics UM3229 Evaluation Board User Manual
- June 13, 2024
- STMicroelectronics
Table of Contents
UM3229
User manual
EVAL-L5965 Evaluation board
Introduction
This document provides information concerning features and usage of the
EVAL-L5965 that is the complete name for the device evaluation board.
Preface
The L5965 is a multichannel voltage regulator specifically designed to support
applications that need to fulfill functional safety requirements as defined by
automotive safety integrity level (ASIL).
It is available in the VQFPN-48 package.
This document describes how to use the L5965 application board in order to
check device’s performance (please refer to the datasheet for more
information).
Hardware description and setup
This section provides a description of the main components of this evaluation
kit, giving instruction for a quick setup of the system.
2.1 EVAL-L5965 board
The motherboard is equipped with the following features (refer to the Figure
1, where the main parts are highlighted):
Table 1. Main parts description
| Part # | Description |
|---|---|
| 1 | Output screw connectors for BUCK’s, BOOST and LDO |
| 2 | V_PRE selection connector |
| 3 | WKUP jumper selection |
| 4 | Main jumpers of control signals |
| 5 | Screw connectors for main and auxiliary power supply (VBAT1, EXTSUP) |
| 6 | Connectors for SPI and auxiliary signals |
| 7 | Device area |
| 8 | Screw connector for SYNCIN |
| 9 | VLIN1 and VLIN2 selection connector |
2.1.1 Power supply section
The board provides two main power supply inputs V_EXT_HV and EXTSUP:
- EXTSUP is intended to supply the VREG internal regulator to improve efficiency (optional)
- V_EXT_HV is intended to supply the VBAT1 pin of the device, the pre-BUCK1 and external HS MOS
The VREG is normally supplied directly from VBAT1 pin, in case is needed in
can be supplied by EXTSUP. To make this transition happened is enough to
provide a voltage higher than a threshold (typically 4.6 V) on EXTSUP pin.
The Figure 2 shows the schematic diagram of V_EXT_HV and EXTSUP connectors.
The main component is the screw connector J1 necessary to provide voltages to
the circuit. They are also equipped with a separated GND terminal for each
supply. Capacitors C5 and C6 reduce the voltage fluctuations. V_EXT_HV is also
present in other sections of the board to provide it as an alternative input
for each regulator. This option is necessary to test a regulator independently
without the influence of the previous one. The R7 resistor works as a jumper
to connect or disconnect the EXTSUP supplies from the device. Anyway, the
default option is to keep it connected through the resistor.
The board provide all the necessary external components and
compensation network for the whole power supplies. In the Figure 3 it is
reported the schematic view for BUCK2 in which are reported the external
components and the external network. For other regulators like BUCK3 or BUCK4
the compensation network is not required because is internally implemented.
The Figure 4 shows the minimum load required by the linear
regulator LDO, similar idea is applied to both linear regulators present in
the device VREF and LDO. The minimum load is related to the spec requirement
of a minimum current mainly for stability purposes.
The Figure 5 shows
the schematic section of BOOST converter. The main external components
required are the inductor L5 that have to be chosen coherently with the
maximum current required, the diode D1 and the output capacitor Cout obtained
with two equal capacitors in parallel C25 and C26.
2.1.2 VLINE
connectors
The Figure 6 and Figure 7 show the schematic section for the two connectors,
SC_CON1 and SC_CON2, that select the input voltages for the different
regulators.
To select the BUCK1 as pre-regulator is needed
to insert an external cable shorting the SC_CON1 connector terminal 1 and 2.
Instead, shorting terminal 2 and 3 selects the BUCK2 as pre-regulator. V_PRE
is the input voltage for all the post-regulators BUCK3, BUCK4 and BOOST. The
SC_CON2 allows to define the input voltage for the BUCK1 and BUCK2. To have
both connected to battery (V_EXT_HV), is necessary to use an external cable
that shorts terminals 1, 3, and 4 together. Instead, if only one is the pre-
regulator, for example the BUCK1, terminal 3 and 4 shall be connected. To
provide the input voltage to BUCK2, configured as post-regulator, terminal 1
and 2 shall be connected.
2.1.3 Jumpers configuration
The Table 2 summarize functionality and configurations for the jumpers
available on the board.
The V_POL is the voltage used as supply for the digital pin pull-up, V_MCU is
a supply coming from micro board, VPRE is the supply voltage for post-
regulators selected by SC_CON1 between BUCK1 and BUCK2 output.
Table 2. Jumpers configuration
| Jumper | Configuration setup |
|---|---|
| Position 1-2 | |
| P1 | V_POL shorted with V_MCU |
| P2 | WKUP pin shorted with a micro signal |
| P_DBG | DEBUG pin shorted with GND |
| P_SYNCIN | SYNCIN pin shorted with a micro signal |
J_SYNCIN connector
| Close| Open
J4| SYNCOUT pin shorted with a micro signal| SYNCOUT not connected with micro
pin
J24| FAULT pin pull-up to V_POL present| FAULT pin pull-up to V_POL not
present
2.2 Typical application
The Figure 8 shows an example of board standard usage. In details are
highlighted the power supply connections VBAT and GND.
The demonstration board is already set to allow the evaluation of the PMIC
features. To run the device properly is needed to connect a compatible voltage
to the connector J1 (V_EXT_HV), to short terminal 2 (V_PRE) with terminal 3
(BUCK2) for connector SC_CON1 and to short terminal 3 (V_EXT_HV), 1 (VLIN2)
and 4 (VLIN1) together for connector SC_CON2.
BUCK2, BUCK3, BUCK4, BOOST and VREF are switched on automatically.
In the example are connected just 3 loads but in real context application can
be used more loads, also more than one load for each regulator.
2.3 Layout
2.4 Schematic
Programming option
The L5965 mounted on this demonstration board is programmed as follows (refer
to product datasheet for more information).
Figure 12. OTP bit mapping
| 15| 14| 13| 12| 11| 10| 9| 8| 7| 6| 5| 4| 3| 2| 1| 0
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---
8| Reset activation = 000| Device identification = 000000| OTP WD REC en = 0|
BUCK1 CFG = 000| CRC
9| Prim Id = 110| Non Prim Seqld = 111| BUCK2 CFG =01010| EnBUCK4 = 1| EnBUCK3
= 1| CRC
10| Seqld BUCK4 = 010| Seqld BUCK3 = 001| BUCK4 CFG = 001| OvRst EN = 1| BUCK3
CFG = 000| CRC
11| Seqld LDO = 111| Seqld BOOST = 011| EnLDO =1| EnBOOST = 1| LDO CFG = 1101|
BOOST CFG = 0| CRC
12| USR Area Protection = 111| Seqld VREF = 100| PowrOn Delay = 01| EnVREF =
1| WDG CFG = 10| VREF CFG = 10| CRC
BUCK2 is the main regulator and provides 3.3 V at 2.6 A and 0.4 MHz. This is
the pre-regulator that supplies the others. BUCK3 is the second regulator to
switch on, and provides 2 V. BUCK4 is the third regulator, supplying 1.8 V.
The fourth regulator to start is the BOOST providing 5 V and the latest one is
the VREF providing 3.3 V. The reset is released after the power-good of the
main regulator (BUCK2). In case of failures, the RESET_B signal does not
affect the state machine, then the regulator can still be evaluated in this
condition. Also an overvoltage cannot assert a reset. All these regulators
turn on with a delay of 2 ms among them. BUCK1 and LDO should be enabled by
SPI. Once enabled, BUCK1 provides 5 V and the LDO supplies 1.3 V at 600 mA.
A watchdog is not required to operate the PMIC and rewriting OTP programming
is forbidden.
Information on board use
This evaluation board is intended for the following uses:
- Engineering development
- Demonstrations
- Evaluation purposes only
It is not considered by STMicroelectronics to be a finished end-product fit
for general consumer use. The people who handle one or more products must have
electronics training and must observe good engineering standard practices.
For this reason, the goods being provided are not intended to be complete in
terms of required design, marketing, and/or manufacturing-related protective
considerations, including product safety and environmental measures typically
found in end products that incorporate such semiconductor components or
circuit boards. This evaluation board/kit does not fall within the purpose of
the European Union directives regarding electromagnetic compatibility,
restricted substances (RoHS), recycling (WEEE), FCC, CE or UL, and therefore
may not meet the technical requirements of these directives or other related
directives.
Revision history
Table 3. Document revision history
| Date | Version | Changes |
|---|---|---|
| 11-Aug-2023 | 1 | Initial release. |
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