Hibernate Mode in the AT73C238/AT73C239 1. Scope This application note decribes the hibernate mode for the AT73C238/AT73C239. 1.1 Power Management Reference Documents Table 1-1 gives the references of the documents and their denominations in this document. Table 1-1. Reference Documents Owner - Reference Title Atmel - 6201.pdf AT73C239 Technical Datasheet Application Note 6240A–PMAAC–19-May-06 2. Operating Conditions Table 2-1. AT73C238/AT73C239 Operating Conditions Parameter/Function Pads Operating Temperature Conditions Min Max Unit -- -40 85 °C Main Input Voltage VDD1, VDD2, VDD3 3.0 3.6 V Backup Input Voltage VBAT 2.5 3.6 V LDO1 Trimming vo1 Trimmed @ 2.75V 2.7 2.8 V LDO2 Trimming vo2 Trimmed @ 1.8V 1.75 1.85 V LDO3 Trimming vo3 Trimmed @ 1.5V 1.45 1.55 V LDO4 Trimming vo4 Trimmed @ 1.5V 1.4 1.6 V 3. Glossary Hibernate Mode -- When this mode is activated, the baseband enters very low consumption mode. In this mode, only the RTC block of the baseband is running, thus the main LDOs are switched off. Trimming -- Action on internal fuse to adjust the output voltage value to the targeted value. 2 Application Note 6240A–PMAAC–19-May-06 Application Note 4. Block Diagram With Hibernate Mode Figure 4-1. Standard Application Diagram with Hibernate Mode LDO1 VBG VBG HPBG VDD1 VIN GPS Antenna VDD 3.0V-3.6V VOUT 1.8V/2.7V GNDA/AVSS VO1 Internal Oscillator VIN 3.0V I/O NC 100 k Baseband COUT1 XRESIN TWD LDO2 VDD2 VIN LNA Reset Generator TWCK GPIO TCXO ILOAD 25 mA TWI RF VDD 3.0V-3.6V XRESO rstin GNDD SM VOUT 1.5V/1.8V VO2 ILOAD 30 mA Fuse1 3.0V I/O Supply Fuse2 COUT2 VZAP VMON POR1 3.0V I/O Backup Supply VBAT VBAT POR2 LDO4 LDO3 VBAT 2.5V-3.6V VDD 3.0V-3.6V VOUT 1.2V/1.5V/1.8V VOUT 1.2V/1.5V/1.8V ILOAD 2 mA ILOAD 60 mA VIN 3.3V VO3 VO4 1.5V Backup Core COUT4 VDD3 Main Supply LPBG 1.5V Core 5. Hibernate Mode 5.1 Scope Hibernate mode puts the application in very low consumption mode. During this phase, the consumption is less than 2mA. In order to achieve this, all the main LDOs are switched off (LDO1, LDO2 and LDO3) by activating the “twck” pin to low level. Only LDO4 remains active so that the baseband RTC block may continue working. To wake up the device (equivalent to quitting Hibernate Mode), a high level should be applied on the “twck” pin. This switches on the main LDOs. 3 6240A–PMAAC–19-May-06 5.2 Timing Diagram Figure 5-1 shows the timing diagram of the behavior of each LDO output voltage for Hibernate Mode. Figure 5-1. Hibernate Mode Timing Diagram Vin 3.0V - 3.6V Time Vbat 2.5V - 3.6V Time TWD Time TWCK LDO1 Time 2.75V LDO2 Time 1.8V Time LDO3 1.5V Time LDO4 1.5V Time 300 µs 4 Application Note 6240A–PMAAC–19-May-06 Application Note 5.3 Output Voltage Values and Behavior on Silicon Table 5-1. AT73C238/AT73C239 Product Output Voltages Parameter/Function Pads LDO1 Output Voltage vo1 Conditions VBAT = VIN = 3.3V, in Normal Mode 2.75 V 0 V 1.8 V 0 V 1.5 V 0 V VBAT = VIN = 3.3V, in Normal Mode 1.5 V VBAT = VIN = 3.3V, in Hibernate Mode 1.5 V VBAT = VIN = 3.3V, in Hibernate Mode VBAT = VIN = 3.3V, in Normal Mode LDO2 Output Voltage vo2 VBAT = VIN = 3.3V, in Hibernate Mode VBAT = VIN = 3.3V, in Normal Mode LDO3 Output Voltage vo3 VBAT = VIN = 3.3V, in Hibernate Mode LDO4 Output Voltage Figure 5-2. Note: Unit vo4 Hibernate Mode Timing Diagram on Silicon These measurements were done without any output loads. 5 6240A–PMAAC–19-May-06 Atmel Corporation 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 487-2600 Regional Headquarters Europe Atmel Sarl Route des Arsenaux 41 Case Postale 80 CH-1705 Fribourg Switzerland Tel: (41) 26-426-5555 Fax: (41) 26-426-5500 Asia Room 1219 Chinachem Golden Plaza 77 Mody Road Tsimshatsui East Kowloon Hong Kong Tel: (852) 2721-9778 Fax: (852) 2722-1369 Japan 9F, Tonetsu Shinkawa Bldg. 1-24-8 Shinkawa Chuo-ku, Tokyo 104-0033 Japan Tel: (81) 3-3523-3551 Fax: (81) 3-3523-7581 Atmel Operations Memory 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 RF/Automotive Theresienstrasse 2 Postfach 3535 74025 Heilbronn, Germany Tel: (49) 71-31-67-0 Fax: (49) 71-31-67-2340 Microcontrollers 2325 Orchard Parkway San Jose, CA 95131, USA Tel: 1(408) 441-0311 Fax: 1(408) 436-4314 La Chantrerie BP 70602 44306 Nantes Cedex 3, France Tel: (33) 2-40-18-18-18 Fax: (33) 2-40-18-19-60 ASIC/ASSP/Smart Cards 1150 East Cheyenne Mtn. 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