Freescale Semiconductor Application Note AN4619 Rev. 1.0, 11/2012 Interfacing the MC34709 with an External Battery Charger 1 Purpose This document shows an example implementation of an external battery charger solution for the MC34709 power management architecture for i.MX processors. 2 Scope This document provides the design-in information (including schematic) for using an external charger with isolator charging path while interfacing with the MC34709 PMIC. It does not provide instruction on how to fully configure the MC34709 system along with an i.MX processor; however, it does refer to them in order to provide a clear idea on how the battery charger would interact in a full system environment. © Freescale Semiconductor, Inc., 2012. All rights reserved. Contents 1 Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 2 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 3 MC34709 Device Overview . . . . . . . . . . . . . . 2 4 Interfacing with an External Battery Charger2 5 References . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 6 Revision History . . . . . . . . . . . . . . . . . . . . . . 6 MC34709 Device Overview 3 MC34709 Device Overview The 34709 is a Power Management Integrated Circuit (PMIC) designed primarily for use with the Freescale i.MX50 and i.MX53 families. It offers a low-cost solution targeting embedded applications that do not require a battery charger. It supports both consumer and industrial applications with a single 130-pin, 8mm x 8mm, 0.5mm-pitch MAPBGA package that is easy to route in low cost board designs. Features: • • • • • • • • • Five buck converters–configurable to provide up to six independent outputs that directly supply the processor core, memory, and peripheral Boost regulator for USB PHY domain on i.MX processors Seven LDO regulators with internal and external pass devices for thermal budget optimization One low-current, high-accuracy voltage reference for DDR memory 10-bit ADC for monitoring battery and other inputs Real-time clock and crystal oscillator circuitry with a coin cell backup/charger SPI/I2C bus for control and register interface Four general purpose low-voltage I/Os with interrupt capability Two PWM outputs The MC34709 can be easily combined with an external charger, allowing flexibility for either single or multi-cell Li-Ion battery configurations. This document presents the MAX8903 battery charger as an example of a battery charging solution for the MC34709 power management device. However, it is up to the customer, according to his system requirements, to select a proper charger device to be used in conjunction with the power management unit. 4 Interfacing with an External Battery Charger The MC34709 power management device, is powered by a single input supply (BP) that provides full system power distribution. BP operating voltage range goes from 3.0 V to 4.5 V; therefore, the charger system voltage must be set within the operating range. One such example of a charger IC, the MAX8903 provides a typical VSYS = 4.325 V, which makes it suitable to supply full system power to the MC34709. The MAX8903 supplies a 4.2 V battery regulation voltage suitable for standard 3.7 V Li-ion batteries, which are used in common portable applications. Figure 1 and Figure 2 show the application schematic, including the external charger and how it connects to the MC34709. Freescale does not assume liability, endorse, or warrant components from external manufacturers that are referenced in circuit drawings or tables. While Freescale offers component recommendations in this configuration, it is the customer’s responsibility to validate their application. AN4619, Rev. 1.0 2 Freescale Semiconductor Interfacing with an External Battery Charger CHARGER SUPPLY GND J2 BATTERY J3 2 1 J126 2 1 SYS_VIN GND J127 2 1 2 1 VBATT 0 BANANA RED 0 CONN BANANA BLACK 2 BANANA RED CONN BANANA BLACK 2 SYS_VIN R76 10K SW5 SW5 U11 C96 10UF 3 4 C101 0.1UF 1 2 6 0 DC1 DC2 DCM VL PG1 PG2 C97 1.0 UF BST FLT C98 0.1UF 2 27 28 UOK LX1 LX2 L13 1UH DOK CHG 1 THM 25 26 17 R77 0 0 10 7 C99 0.15UF 15 14 GPIOLV0 12 29 0 R97 10K 0 R79 0 5 9 CS1 CS2 ISET 18 R80 10K R81 10K R82 10K 0 CHF_FLT_B UOK_B 8 DOK_B 22 CHG_STATUS1_B 16 13 R85 10K R86 604 0 IDC 11 R87 3.0K CT SYS1 SYS2 R84 10K 19 USB IUSB R83 10K 24 23 0 Signalization to MCU/PMIC GPIO Interface BP USUS CEN GND EP BAT1 BAT2 C100 10UF 21 20 0 Connect SYS1 and SYS2 pins to BP (system voltage) VBATT MAX8903 External Charger 0 NOTE: pins DCM, IUSB, CEN, USUS may also be connected to MCU/PMIC GPIO interface for charger control if required. Figure 1. External Charger Connection Diagram AN4619, Rev. 1.0 Freescale Semiconductor 3 Interfacing with an External Battery Charger U1A BP_SENSE1 BP ADIN10 J5 ADIN11 J6 BP ADIN10 ADIN10 ADIN11 ADIN11 General Purpose ADCs NC_2 K6 TSREF TSX1 K5 TSX2 L4 TSY1 L6 TSY2 L3 TSREF TSX1/ADIN12 TSX1 TSX2/ADIN13 TSX2 0 R51 10.0K HDR 1X2 TH 1 2 2 1 HDR 1X2 TH 1 2 HDR 1X2 TH SPIVCC J29 R14 2.0K A14 B15 LDO_3V3 Touch Screen Interface TSY2/ADIN15 TSY2 3 2 1 VCOREDIG J31 NC_3 J120 HDR 1X2 TH 0 R1 TSY1/ADIN14 TSY1 J25 C3 10UF NC_1 USB/Audio TSREF1 C9 2.2UF N1 1 ADIN9 ADIN9 2 H6 ADIN9 PWM1 HDR 1X3 PWM2 PWM1 0 J30 R15 2.0K J32 SW5 1 2 3 R16 10.0K SPIVCC PWM2 HDR 1X3 GPIOVDD C61 0.1uF GPIOLV0 A4 0 SPIVCC GPIOLV1 B2 CLK B1 MISO/SDA A2 CS CLK SPI/I2C Interface GPIOLV2 GPIOLV3 MOSI CLK32K Control Logic CLK32KMCU CLK32KVCC VSRTC VDDLP1 L1 VDDLP VCOREDIG1 VCOREDIG VCORE1 VCOREDIG J2 VCORE REFCORE1 K1 REFCORE HDR 1X3 GPIOLV1 GPIOLV3 B9 1 2 3 GPIOLV0 GPIOLV2 B7 GPIOLV2 E10 GPIOLV3 E3 CLK32k G3 CLK32KMCU F3 H2 VSRTC C46 0.1UF Reference Generation VSRTC1 0 J58 3 2 1 VCOREREF C22 1.0UF SW5 VDBG HDR 1X3 C23 0.1UF 0 VDBG GPIOLV1 C7 VDDLP J1 VCORE C21 1.0UF SW5 GPIOLV0 C8 MISO B3 MOSI 0 PWM2 J62 C64 1.0UF DNP 0 0 PWM1 A7 SPIVCC VDBG CS C20 0.01UF A8 CLKVCC1 0 WDI1 Coincell M2 LICELL RESET 2 C41 0.1UF LICELL RESETBMCU 0 INT STANDBY 0 GLBRST PWRON1 TP_XTAL2 PWRON2 R65 R64 0 XTAL2 0 XTAL1 G1 XTAL2 E1 PUMS2 XTAL1 Y1 2 PUMS1 Crystal Oscillator PUMS3 1 PUMS4 32.768KHZ C49 C50 18PF 0 TP_XTAL1 PUMS5 ICTEST 18PF SDWN1 SDWN D6 SDWN 1 BAT1 WDI K3 WDI Battery Backup RESETB1 RESETB B5 RESETBMCU1 RESETBMCU D5 INT1 INT B4 STANDBY1 STANDBY P1 GLBRST A5 PWRON1 A6 PWRON2 E5 G6 PUMS1 G5 GLBRST1 PWRON1 1 SW2 1 SW3 1 SW4 2 FSMSM 0 PUMS3 F5 PUMS4 E6 PUMS5 A9 ICTEST MC34709 0 2 FSMSM PWRON2 PUMS2 F6 2 FSMSM R68 SW5 WDI 10.0K PC34709VK SPIVCC R46 R31 3 2 1 NSRD130LNXTG5 U10 NCP4682 A D28 C NSRD130LNXTG5 C103 0.1UF 0 VIN 0 C VDDLP NSRD130LNXTG5 0 SW5 LED_GREEN 200 J69 J64 3 2 1 C102 0.1UF 0 RESETB 0 1 HDR 1X3 HDR 1X3 0 J68 3 2 1 VCOREDIG PUMS2 VCOREDIG PUMS5 VSRTC WORKAROUND HDR 1X3 0 VCOREDIG PUMS3 3 2 1 HDR 1X3 R34 VCORE ICTEST R33 10.0K 200 RESETB RESETBMCU D5 A BP R32 10.0K J60 Q7 BSH103 0 0 J67 3 2 1 2 A 2 4 VOUT 1 HDR 1X3 C LED_GREEN RESETBMCU 3 BP CE VCOREDIG PUMS4 10.0K 1 2 4 HDR 1X3 1 3 3 3 2 1 VCOREDIG PUMS1 C D27 GND TAB_GND C 2 5 LICELL A D26 SDWN D4 A BP J65 3 J74 0 Q8 BSH103 0 Figure 2. MC34709 Connection Diagram 4.1 Control Interface Signals Since the external charger provides an isolated charging path with internal charging logic, the battery charging process is fully transparent to the MC34709 and the system itself. However, depending on the external charger IC selected by the customer, parallel control and signaling pins may be required to interact with GPIO signals from either the MCU or the MC34709, thereby providing full charging control and signaling to/from the system controller. For further information on the external charger component selection, please refer to the vendor datasheet. AN4619, Rev. 1.0 4 Freescale Semiconductor References 5 References Document Number Description Data sheet MC34709 MC34709ER Errata MC34709FS Fact Sheet Product Summary Page Power Management Home Page Analog Home Page URL http://cache.freescale.com/files/analog/doc/data_sheet/ MC34709.pdf http://cache.freescale.com/files/analog/doc/errata/ MC34709ER.pdf http://cache.freescale.com/files/analog/doc/fact_sheet/ MC34709FS.pdf http://www.freescale.com/webapp/sps/site/ prod_summary.jsp?code=MC34709 www.freescale.com/PMIC www.freescale.com/analog AN4619, Rev. 1.0 Freescale Semiconductor 5 Revision History 6 Revision History Revision Date 1.0 11/2012 Description of Changes • Initial release AN4619, Rev. 1.0 6 Freescale Semiconductor Revision History AN4619, Rev. 1.0 Freescale Semiconductor 7 How to Reach Us: Information in this document is provided solely to enable system and software Home Page: freescale.com implementers to use Freescale products. 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