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1. 20 February 2009 6 of 8 AN10047 Handheld devices using the ISP1582 3 ST NXP Wireless 5 Legal information Please Read Carefully Information in this document is provided solely in connection with ST NXP products ST NXP Wireless NV and its subsidiaries ST NXP reserve the right to make changes corrections modifications or improvements to this document and the products and services described herein at any time without notice All ST NXP products are sold pursuant to ST NXP s terms and conditions of sale Purchasers are solely responsible for the choice selection and use of the ST NXP products and services described herein and ST NXP assumes no liability whatsoever relating to the choice selection or use of the ST NXP products and services described herein No license express or implied by estoppel or otherwise to any intellectual property rights is granted under this document If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST NXP for the use of such third party products or services or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein UNLESS OTHERWISE SET FORTH IN ST NXP S TERMS AND CONDITIONS OF SALE ST NXP DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND OR SALE O2. reset can be performed using the Mode register OCh In the Mode register write logic 1 followed by logic 0 to the SFRESET bit to enable the software initiated reset to the ISP1582 3 The ISP1582 3 must be reinitialized to the default setting If however the ISP1582 3 is reset before the DC charger is connected to the USB port you may just enable the SoftConnect SOFTCT bit in the Mode register Writing logic 1 to bit SOFTCT will enable the connection of the 1 5 KQ pull up resistor on pin RPU to the DP line The device is now ready for bus enumeration Steps 1 to 3 are for the systems that do not know whether Vsus is from a DC charger or a USB cable This makes the firmware easier to manage 4 Ifa DC charger is connected to the USB port there will be no activity on the bus and the microcontroller will receive a suspend interrupt After the microcontroller has received the suspend interrupt the microcontroller can set the ISP 1582 3 to sleep mode again If the connection is using a USB cable then the device is ready for bus enumeration 5 If your system has masked off the interrupt and can detect that Vgus is from the DC charger it is advisable to wait for more than 3 ms The delay is required for the ISP1582 3 to enter the correct internal state This is prompted by the ISP1582 3 through the interrupt when the ISP1582 3 is ready for suspend 3 2 Low battery situation When the battery for handheld devices is low while there is commu
3. 2 3 to achieve lowest power consumption for various scenarios This is because most handheld devices are battery operated and are required to work in lowest power consumption mode when in idle state ST NXP Wireless All rights reserved AN10047_4 Application note Rev 04 20 February 2009 4of8 ST NXP Wireless AN10047 Handheld devices using the ISP1582 3 3 1 Connecting a DC charger to the USB port Some handheld devices may have battery charging through the USB port These devices may encounter problems such as waking up the ISP1582 3 unnecessarily when the DC charger is connected to the USB port The ISP1582 3 can be woken up from suspend in any of the following ways e Activities on the bus e Wake up on chip select e Using the WAKEUP pin e Presence of Veus The following steps can be used to set the ISP1582 3 into suspend mode if a DC charger is connected to the USB port instead of a USB cable 1 The device must be in suspend mode It is recommended though not necessary that the device is interrupt driven The device must have the Vgus present interrupt enabled 2 On detecting the presence of a Vpus interrupt or the Vgus status bit issue an unlock command by using the Unlock Device register 7Ch to unlock the chip Write unlock code AA37h to the Unlock Device register 3 Issue a soft reset and enable SoftConnect A soft reset is needed if you do not know the previous states of the 1SP1582 3 Soft
4. F ST NXP PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY FITNESS FOR A PARTICULAR PURPOSE AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION OR INFRINGEMENT OF ANY PATENT COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT UNLESS EXPRESSLY APPROVED IN WRITING BY AN AUTHORIZED ST NXP REPRESENTATIVE ST NXP PRODUCTS ARE NOT RECOMMENDED AUTHORIZED OR WARRANTED FOR USE IN MILITARY AIR CRAFT SPACE LIFE SAVING OR LIFE SUSTAINING APPLICATIONS NOR IN PRODUCTS OR SYSTEMS WHERE FAILURE OR MALFUNCTION MAY RESULT IN PERSONAL INJURY DEATH OR SEVERE PROPERTY OR ENVIRONMENTAL DAMAGE ST NXP PRODUCTS WHICH ARE NOT SPECIFIED AS AUTOMOTIVE GRADE MAY ONLY BE USED IN AUTOMOTIVE APPLICATIONS AT USER S OWN RISK Resale of ST NXP products with provisions different from the statements and or technical features set forth in this document shall immediately void any warranty granted by ST NXP for the ST NXP product or service described herein and shall not create or extend in any manner whatsoever any liability of ST NXP ST NXP and the ST NXP logo are trademarks or registered trademarks of ST NXP in various countries Information in this document supersedes and replaces all information previously supplied The ST NXP logo is a registered trademark of ST NXP Wireless All other names are the property of their respective owners 2009 ST NXP Wireless All rights reserved ST NXP Wireless group of companies Belgium Brazil C
5. PIO of processor for sensing Vays 5 V TO 3 3 V VOLTAGE REGULATOR Veciava ISP1583 Veco S Supplied through the power source of the system Fig 1 Power sharing mode In power sharing mode the processor will experience continuous interrupt when Vays is lost see Fig 2 This is because the default status of the interrupt pin when operating in sharing mode with Vgus not present is LOW To overcome this implement external Vgus ST NXP Wireless All rights reserved Application note Rev 04 20 February 2009 3 of 8 AN10047 ST NXP Wireless Handheld devices using the ISP1582 3 sensing circuitry The output from the voltage regulator can be connected to pin GPIO of the processor to qualify the interrupt from the ISP1583 Veco Veca v3 n fe INT power off power off O0daa9459 Fig 2 Interrupt pin status during power off in power sharing mode 2 2 Bus powered mode In bus powered mode Vecv3 and Veco are supplied by the output of the 5 V to 3 3 V voltage regulator see Fig 3 The input to the regulator is from Vgus On plugging in the USB cable the ISP1582 3 goes through the power on reset cycle In this mode OTG is disabled 5 V TO 3 3 V VOLTAGE REGULATOR Veus Vociava ISP 1582 83 Veco Fig 3 Bus powered mode 3 Suspending a device In the following subsections you will find the recommended sequence to properly suspend the ISP158
6. PP ST ERICSSON IMPORTANT NOTICE Dear customer As from February 2nd 2009 ST and Ericsson have merged Ericsson Mobile Platforms and ST NXP Wireless into a 50 50 joint venture ST Ericsson As a result the following changes are applicable to the attached document e Company name ST NXP Wireless is replaced with ST Ericsson e Copyright the copyright notice at the bottom of each page ST NXP Wireless 200x All rights reserved shall now read ST Ericsson 2009 All rights reserved Web site http www stnwireless com is replaced with www stericsson com Contact information the list of sales offices previously obtained at http www stnwireless com is now found at www stericsson com under Contacts If you have any questions related to the document please contact our nearest sales office or wired support stericsson com Thank you for your cooperation and understanding AN10047 Handheld devices using the ISP1582 ISP1583 Rev 04 20 February 2009 Application note Document information Info Content Keywords isp1582 isp1583 usb universal serial bus Abstract This is an application note on handheld devices using the ISP1582 or ISP1583 ST NXP Wireless ST NXP Wireless AN10047 Handheld devices using the ISP1582 3 Revision history Rev Date Description 04 20090220 Globally changed NXP Semiconductors and NXP to ST NXP Wireless Also updated the legal
7. anada China Czech Republic Finland France Germany India Italy Japan Korea Malaysia Mexico Netherlands Singapore Sweden Switzerland Taiwan United Kingdom United States of America www stnwireless com ST NXP Wireless All rights reserved AN10047_4 7 of 8 Application note Rev 04 20 February 2009 ST NXP Wireless AN10047 Handheld devices using the ISP1582 3 6 Contents 1 Introduction ee 3 2 Power MOE cccceseseeeeeeeeeneeeeseeeennseneeeeseeneneesaees 3 2 1 Power sharing Mode icenen 2 2 Bus powered MOE is ssiiciisiisssuiieriiniyia 4 3 Suspending a deVICE ccccceseeeeeseeeeeeeeneseeeees 4 3 1 Connecting a DC charger to the USB port 3 2 Low battery situation oe ceeeeeeeeeeeneeeeeenes 4 Device suspend CUITeNt ccceeeee eee eeeeeeeeeeee 5 Legal information ccccseseeeeeeeeeeeeeeeeeeeeneneeeee 7 6 Contents oi oi ssiceeiecceccesnssceeesdecesecuceedaneaseusuuecasenseeds 8 Please be aware that important notices concerning this document and the product s described herein have been included in the section Legal information ST NXP Wireless 2009 All rights reserved For more information please visit http www stnwireless com For sales office addresses email to salesaddresses stnwireless com Date of release 20 February 2009 Document identifier AN10047_4
8. nication between the host and peripheral that is with the USB cable connected the ISP1582 3 must be set into suspend mode The following steps can be performed to suspend the ISP1582 3 1 SoftConnect is a trademark of ST NXP Wireless AN10047_4 ST NXP Wireless All rights reserved Application note Rev 04 20 February 2009 5 of 8 ST NXP Wireless AN10047 Handheld devices using the ISP1582 3 1 Force the 1SP1582 3 into full speed mode by writing logic 1 to the FORCEFS bit in the Test Mode register 84h 2 Disable SoftConnect by writing logic 0 to the SOFTCT bit in the Mode register OCh 3 Issue a soft reset to the 1ISP1582 3 by writing logic 1 followed by logic 0 to the SFRESET bit in the Mode register 4 Wait for a minimum of 3 ms before sending the ISP1582 3 back into suspend mode 4 Device suspend current Table 1 shows the suspend current measurement of the ISP1582 3 under various conditions Table 1 Suspend current measurement CLKAON Supply voltage Test conditions Core mA 1 0 mA On Veco 3 3 V Suspend with PLL on 19 60 3 48 Vec 0 3 3 V Off Veco 3 3 V Suspend with PLL off Vsus present 0 107 3 48 Vecio 3 3V SoftConnect on Off Veco 3 3 V Suspend with PLL off Vsus present 0 105 3 52 Veco 3 3V SoftConnect off Off Veco 3 3 V Suspend with PLL off Vsus not present 0 107 3 50 Vec 0 3 3 V AN10047_4 ST NXP Wireless All rights reserved Application note Rev 04
9. text 03 20080121 Third release Updated Section 2 02 20060906 Second release Section 2 1 updated the second paragraph 01 20050301 First release Contact information For additional information please visit http www stnwireless com For sales office addresses please send an email to salesaddresses stnwireless com AN10047_4 ST NXP Wireless All rights reserved Application note Rev 04 20 February 2009 2 of 8 ST NXP Wireless AN10047 Handheld devices using the ISP1582 3 1 Introduction This document explains the application of handheld devices using the ISP1582 or ISP1583 2 Power mode 2 1 AN10047_4 Handheld devices can be powered using either power sharing mode or bus powered mode The ISP1582 supports bus powered mode and the ISP1583 supports both bus powered and power sharing modes Power sharing mode As can be seen in Fig 1 in power sharing mode Vcc 3va is supplied by the output of the 5 V to 3 3 V voltage regulator The input to the regulator is from Vpus Veco is supplied through the power source of the system When the USB cable is plugged in the ISP1583 goes through the power on reset cycle In this mode OTG is disabled In power sharing mode it is recommended that you connect pull up signals to Veco instead of Vecva This is to ensure that when Veus is lost interfacing signals are properly handled Connect RPU to Vecgvs through a 1 5 KQ pull up resistor to G
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