AN97793 Migrating from FM24V02/FM24V01 to CY15B256J/CY15B128J Automotive F-RAM™ Author: Girija Chougala Associated Part Family: FM24V02, FM24V01, CY15B256J, CY15B128J Related Documents: For a complete list, click here AN97793 discusses the key differences that need to be considered when migrating from FM24V02/FM24V01 to CY15B256J/CY15B128J Automotive F-RAM. FM24V02/FM24V01 is now “Not Recommended for New Designs”; this application note explains how CY15B256J/CY15B128J is a replacement for FM24V02/FM24V01. 1 Introduction CY15B256J/CY15B128J, a 256-Kbit/128-Kbit Automotive I2C 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 CY15B256J/CY15B128J. 2 Device Compatibility From a hardware point of view, the two devices are identical. From a software point of view, the two devices are identical except for the power-up to first-access specification (tPU) and Device ID. Refer to Critical Considerations section for more details. Table 1 highlights the compatibility chart of FM24V02/FM24V01 and CY15B256J/CY15B128J. For a detailed comparison, see Table 3. Table 1. Compatibility Chart FM24V02/FM24V01 Feature or Spec www.cypress.com Is CY15B256J/CY15B128J Compatible? Package Yes Pinout Yes Temperature Range Yes Operating Voltage Yes Operating Current Yes Standby Current Yes Read / Write Function Yes Timing / Frequency Yes Data Retention Yes Endurance Yes Document No. 001-97793 Rev. ** 1 Migrating from FM24V02/FM24V01 to CY15B256J/CY15B128J Automotive F-RAM™ 3 Ordering Part Numbers Table 2 provides the recommended CY15B256J/CY15B128J 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 CY15B256J/CY15B128J Status Ordering Part Number FM24V02-G FM24V02-GTR FM24V01-G Status CY15B256J-SXA CY15B256J-SXAT Not Recommended for New Designs In production CY15B128J-SXA FM24V01-GTR 4 Comments No hardware change required Software change required CY15B128J-SXAT Comparison of FM24V02/FM24V01 and CY15B256J/CY15B128J Table 3 provides a detailed comparison of the two devices. Table 3. Detailed Comparison Table FM24V02/FM24V01 CY15B256J/CY15B128J 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 CY15B256J/CY15B128J is slower in first access 004100h 004121h (FM24V01) (CY15B128J) 004200h 004221h (FM24V02) (CY15B256J) Active Supply Current (max) Data Retention Device ID www.cypress.com Document No. 001-97793 Rev. ** Identical Identical Different. Refer to Device ID section in Critical Considerations for more details. 2 Migrating from FM24V02/FM24V01 to CY15B256J/CY15B128J Automotive F-RAM™ FM24V02/FM24V01 Sleep function The I2C 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) CY15B256J/CY15B128J The I2C F-RAM enters Sleep Mode only if the STOP condition is issued Comments Different. Refer to Sleep Function section in Critical Considerations for more details. Not specified. This is not an industry standard specification VOL = 0.4 V @ IOL = 2 mA, VDD ≥ 2.7 V VOL = 0.4 V @ IOL = 3 mA, VDD ≥ 2.0 V CY15B256J/CY15B128J 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 CY15B256J/CY15B128J 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 CY15B256J/CY15B128J 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 CY15B256J/CY15B128J has additional min spec to meet the NXP I2C specification Input fall time (tF) @ 3.4 MHz Max: 80 ns Min: 10 ns Max: 80 ns CY15B256J/CY15B128J 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 CY15B256J/CY15B128J has additional min spec to meet the NXP I2C specification ACK output valid time (tVD:ACK) Max: 130 ns CY15B256J/CY15B128J has additional max spec to meet the NXP I2C specification Max: 450 ns CY15B256J/CY15B128J has additional max spec to meet the NXP I2C specification Max: 80 ns CY15B256J/CY15B128J has additional max spec to meet the NXP I2C specification Min: 20 * (VDD / 5.5 V) ns Max: 120 ns CY15B256J/CY15B128J has additional spec to meet the NXP I2C specification @ 3.4 MHz ACK output valid time (tVD:ACK) @ 1 MHz Output fall time from VIH min to VIL max (tOF) @ 3.4 MHz Output fall time from VIH min to VIL max (tOF) @ 1 MHz www.cypress.com Document No. 001-97793 Rev. ** 3 Migrating from FM24V02/FM24V01 to CY15B256J/CY15B128J Automotive F-RAM™ 5 Critical Considerations You should consider all the parameter differences mentioned in Table 3 during the migration to CY15B256J/CY15B128J. This section discusses the critical differences. System designers should also review the datasheet when migrating to the new part. 5.1 Power-Up to First Access (tPU) Power-up to first access specification (tPU) is slower in CY15B256J/CY15B128J device compared to FM24V02/FM24V01. Ensure that the CY15B256J/CY15B128J device is accessed only after 1 ms from power-up. 5.2 Device ID Feature The CY15B256J/CY15B128J 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 provides a Device ID of FM24V02/FM24V01 and CY15B256J/CY15B128J. System software needs to be updated for Device ID while migrating to the CY15B256J/CY15B128J. Table 4. Device ID [Note] Device ID FM24V01 CY15B128J 004100h 004121h FM24V02 CY15B256J 004200h 004221h Note: Device ID difference highlighted in red color. 5.3 Sleep Function A low power state called Sleep Mode is supported by FM24V02/FM24V01 and CY15B256J/CY15B128J 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. 2. 3. 4. 5. 6. 7. 8. 9. The master sends a START command. The master sends Reserved Slave ID F8h. The F-RAM (slave device) sends an ACK. The master sends the I2C-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). The F-RAM sends an ACK. Only one device whose I2C-bus slave address matches with the address byte sent by master must acknowledge it. The master sends a Re-START command. The master sends Reserved Slave ID 86h. The F-RAM sends an ACK. 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 CY15B256J/CY15B128J, 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 CY15B256J/CY15B128J. www.cypress.com Document No. 001-97793 Rev. ** 4 Migrating from FM24V02/FM24V01 to CY15B256J/CY15B128J Automotive F-RAM™ 6 Summary AN97793 discussed the differences between FM24V02/FM24V01 and CY15B256J/CY15B128J that need to be considered during migration to the CY15B256J/CY15B128J. 7 Related Documents Datasheets CY15B256J: 256-Kbit (32K × 8) Automotive Serial (I2C) F-RAM CY15B128J: 128-Kbit (16K × 8) Automotive Serial (I2C) F-RAM www.cypress.com Document No. 001-97793 Rev. ** 5 Migrating from FM24V02/FM24V01 to CY15B256J/CY15B128J Automotive F-RAM™ Document History Document Title: AN97793 - Migrating from FM24V02/FM24V01 to CY15B256J/CY15B128J Automotive F-RAM™ Document Number: 001-97793 Revision ** ECN 4800997 www.cypress.com Orig. of Change GVCH Submission Date 06/17/2015 Description of Change New application note Document No. 001-97793 Rev. ** 6 Migrating from FM24V02/FM24V01 to CY15B256J/CY15B128J Automotive F-RAM™ Worldwide Sales and Design Support Cypress maintains a worldwide network of offices, solution centers, manufacturer’s representatives, and distributors. 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