AN94901 Migrating from FM24V02/FM24V01 to FM24V02A/FM24V01A Author: Girija Chougala Associated Project: No Associated Part Family: FM24V02, FM24V01, FM24V02A, FM24V01A Software Version: None Related Documents: For a complete list, click here AN94901 discusses the key differences that need to be considered when migrating from FM24V02/FM24V01 to FM24V02A/FM24V01A. FM24V02/FM24V01 is now “Not Recommended for New Designs”; this application note explains how FM24V02A/FM24V01A is a replacement for FM24V02/FM24V01. Table 1. Compatibility Chart Introduction 2 FM24V02A/FM24V01A, a 256-Kbit/128-Kbit I C F-RAM™, is a replacement device for FM24V02/FM24V01, which is now “Not recommended for new designs”. The two devices are identical in terms of pinout, package composition and dimensions, and read/write functionality. This application note discusses the key differences between the two devices that need to be considered when migrating from FM24V02/FM24V01 to FM24V02A/ FM24V01A. FM24V02/FM24V01 Feature or Spec Is FM24V02A/FM24V01A compatible? Package Yes Pinout Yes Temperature Range Yes Operating Voltage Yes Operating Current Yes Drop-In Replacement or Not? Standby Current Yes From a hardware point of view, the two devices are identical. From a software point of view as well, except for the power-up to first-access timing parameter (tPU) and Device ID, the two devices are identical. Read / Write Function Yes Timing / Frequency Yes Data Retention Yes Refer “Critical Considerations” section for more details. Endurance Yes Table 1 highlights the compatibility chart of FM24V02/FM24V01 and FM24V02A/FM24V01A. For a detailed comparison, see Table 3. Ordering Part Numbers Table 2 gives the recommended FM24V02A/FM24V01A ordering part numbers that correspond to the FM24V02/FM24V01 (Not Recommended for New Designs) ordering part numbers. Table 2. Recommended Ordering Part Numbers for Migration FM24V02/FM24V01 Ordering Part Number FM24V02A/FM24V01A Status FM24V02-G FM24V02-GTR FM24V01-G FM24V01-GTR www.cypress.com Ordering Part Number Comments Status FM24V02A-G Not Recommended for New Designs FM24V02A-GTR In production FM24V01A-G No hardware change required Software change required FM24V01A-GTR Document No. 001-94901 Rev. ** 1 Migrating from FM24V02/FM24V01 to FM24V02A/FM24V01A Comparison of FM24V02/FM24V01 and FM24V02A/FM24V01A Table 3 gives a detailed comparison of the two devices. Table 3. Detailed Comparison Table FM24V02/FM24V01 FM24V02A/FM24V01A Comments Package Types -G -G Identical “green (RoHS)” packages. Pinout/ Package Outlines SOIC-8 SOIC-8 Identical pinout, outline and board footprint. Temperature Range –40 ºC to +85 ºC –40 ºC to +85 ºC Identical Operating Voltage Range 2.0 V to 3.6 V 2.0 V to 3.6 V Identical 175 µA @ 100 KHz 175 µA @ 100 KHz 400 µA @ 1 MHz 400 µA @ 1 MHz 1000 µA @ 40 MHz 1000 µA @ 40 MHz Standby Current (max) 150 µA @ 85 ºC 150 µA @ 85 ºC Identical Sleep Current (max) 8 µA @ 85 ºC 8 µA @ 85 ºC Identical Read / Write Function 2-byte addressing, slave IDs, device select bits 2-byte addressing, slave IDs, device select bits Identical Clock Frequency 3.4 MHz 3.4 MHz Identical 10 years (+85 ºC) 10 years (+85 ºC) 38 years (+75 ºC) 38 years (+75 ºC) 151 years (+65 ºC) 151 years (+65 ºC) Endurance (Write/Read Cycles) 1E+14 1E+14 Identical Power-Up to First Access (tPU, max) 250 µs 1 ms FM24V02A/FM24V01A is slower in first access 004100h 004101h (FM24V01) (FM24V01A) 004200h 004201h (FM24V02) (FM24V02A) Active Supply Current (max) Data Retention Device ID 2 The I2C F-RAM enters Sleep Mode only if the STOP condition is issued Identical Identical Different. Refer to Device ID section in “Critical Considerations” for more details. Sleep function The I C F-RAM enters Sleep Mode irrespective of the STOP condition Output LOW voltage (max) VOL = 0.2 V @ IOL = 150 μA, VDD ≥ 2.0 V Output LOW voltage (max) VOL = 0.4 V @ IOL = 2 mA, VDD ≥ 2.7 V VOL = 0.4 V @ IOL = 3 mA, VDD ≥ 2.0 V FM24V02A/FM24V01A has better spec of higher drive current at lower VDD Output LOW voltage (max) - VOL = 0.6 V @ IOL = 6 mA, VDD ≥ 2.0 V FM24V01A/FM24V02A has additional spec to meet the NXP I2C specification Data in hold (tHD:DAT) @ 3.4 MHz Min: 0 ns Min: 0 ns Max: 70 ns FM24V01A/FM24V02A has additional max spec to meet the NXP I2C specification Input rise time (tR) @ 3.4 MHz Max: 80 ns Min: 10 ns Max: 80 ns FM24V01A/FM24V02A has additional min spec to meet the NXP I2C specification www.cypress.com Different. Refer to Sleep Function section in “Critical Considerations” for more details. Not specified. This is not an industry standard specification Document No. 001-94901 Rev. ** 2 Migrating from FM24V02/FM24V01 to FM24V02A/FM24V01A FM24V02/FM24V01 FM24V02A/FM24V01A Comments Input fall time (tF) @ 3.4 MHz Max: 80 ns Min: 10 ns Max: 80 ns FM24V01A/FM24V02A has additional min spec to meet the NXP I2C specification Input fall time (tF) @ 1.0 MHz Max: 120 ns Min: 20 * (VDD / 5.5 V) ns Max: 120 ns FM24V01A/FM24V02A has additional min spec to meet the NXP I2C specification - Max: 130 ns FM24V01A/FM24V02A has additional max spec to meet the NXP I2C specification - Max: 450 ns FM24V01A/FM24V02A has additional max spec to meet the NXP I2C specification Output fall time from VIH min to VIL max (tOF) @ 3.4 MHz - Max: 80 ns FM24V01A/FM24V02A has additional max spec to meet the NXP I2C specification Output fall time from VIH min to VIL max (tOF) @ 1 MHz - Min: 20 * (VDD / 5.5 V) ns Max: 120 ns FM24V01A/FM24V02A has additional spec to meet the NXP I2C specification ACK output valid time (tVD:ACK) @ 3.4 MHz ACK output valid time (tVD:ACK) @ 1 MHz Critical Considerations You should consider all the parameter differences mentioned in Table 3 during the migration to FM24V02A/FM24V01A. This section discusses the critical differences. System designers should also review the datasheet when migrating to the new part. Power-Up to First Access (tPU) Power-up to first access specification (tPU) is slower in FM24V02A/FM24V01A device compared to FM24V02/FM24V01. Ensure that the FM24V02A/FM24V01A device is accessed only after 1 ms from power-up. Device ID Feature The FM24V02A/FM24V01A and FM24V02/FM24V01 incorporates a 9-byte read-only Device ID to identify the product uniquely. The Device ID allows the host to determine the manufacturer, product density, and product revision. Table 4 gives a Device ID of FM24V02/FM24V01 and FM24V02A/FM24V01A. System software needs to be updated for Device ID while migrating to the FM24V02A/FM24V01A. Table 4. Device ID Device ID [Note] FM24V01 FM24V01A 004100h 004101h FM24V02 FM24V02A 004200h 004201h Note: Device ID difference highlighted in red color www.cypress.com Document No. 001-94901 Rev. ** 3 Migrating from FM24V02/FM24V01 to FM24V02A/FM24V01A Sleep Function A low power state called Sleep Mode is supported by FM24V02/FM24V01 and FM24V02A/FM24V01A devices. The devices will enter in to sleep mode when the Reserved Slave ID 86h is clocked-in as explained in the following sequence: 1. The master sends a START command. 2. The master sends Reserved Slave ID F8h. 3. The F-RAM (slave device) sends an ACK. 2 4. The master sends the I C-bus slave address of the slave (F-RAM) device it needs to identify. The last bit is a 'Don't care' value (R/W bit). 2 5. The F-RAM sends an ACK. Only one device whose I Cbus slave address matches with the address byte sent by master must acknowledge it. 6. The master sends a Re-START command. 7. The master sends Reserved Slave ID 86h. 8. The F-RAM sends an ACK. 9. The master sends STOP and the slave device enters into sleep mode. However there is a minor difference in the sleep mode entry. Step 9 – Sending STOP condition, is mandatory for FM24V02A/FM24V01A, whereas it is an optional step for FM24V02/FM24V01. FM24V02/FM24V01 generates an unintended STOP during sleep mode entry. Refer to Errata section of FM24V02/FM24V01 datasheet for more details. The Errata is not applicable for FM24V02A/FM24V01A. Summary AN94901 discussed the differences between FM24V02/FM24V01 and FM24V02A/FM24V01A that need to be considered during migration to the FM24V02A/FM24V01A. www.cypress.com Document No. 001-94901 Rev. ** 4 Migrating from FM24V02/FM24V01 to FM24V02A/FM24V01A Related Documents Datasheet FM24V02: 256-Kbit (32K × 8) Serial (I2C) F-RAM FM24V01: 128-Kbit (16K × 8) Serial (I2C) F-RAM FM24V02A: 256-Kbit (32K × 8) Serial (I2C) F-RAM FM24V01A: 128-Kbit (16K × 8) Serial (I2C) F-RAM www.cypress.com Document No. 001-94901 Rev. ** 5 Migrating from FM24V02/FM24V01 to FM24V02A/FM24V01A Document History Document Title: AN94901 - Migrating from FM24V02/FM24V01 to FM24V02A/FM24V01A Document Number: 001-94901 Revision ** ECN 4701473 www.cypress.com Orig. of Change GVCH Submission Date 03/26/2015 Description of Change New Spec. Document No. 001-94901 Rev. ** 6 Migrating from FM24V02/FM24V01 to FM24V02A/FM24V01A Worldwide Sales and Design Support Cypress maintains a worldwide network of offices, solution centers, manufacturer’s representatives, and distributors. To find the office closest to you, visit us at Cypress Locations. PSoC® Solutions Products Automotive cypress.com/go/automotive psoc.cypress.com/solutions Clocks & Buffers cypress.com/go/clocks PSoC 1 | PSoC 3 | PSoC 4 | PSoC 5LP Interface cypress.com/go/interface Lighting & Power Control cypress.com/go/powerpsoc Memory cypress.com/go/memory PSoC cypress.com/go/psoc Touch Sensing cypress.com/go/touch USB Controllers cypress.com/go/usb Wireless/RF cypress.com/go/wireless Cypress Developer Community Community | Forums | Blogs | Video | Training Technical Support cypress.com/go/support PSoC is a registered trademark of Cypress Semiconductor Corp. All other trademarks or registered trademarks referenced herein are the property of their respective owners. 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The inclusion of Cypress’ product in a life-support systems application implies that the manufacturer assumes all risk of such use and in doing so indemnifies Cypress against all charges. Use may be limited by and subject to the applicable Cypress software license agreement. www.cypress.com Document No. 001-94901 Rev. ** 7