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M48Z35AY-70PC6TR Datasheet(PDF) 10 Page - STMicroelectronics |
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M48Z35AY-70PC6TR Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 16 page M48Z35AY, M48Z35AV 10/16 Also, as VCC rises, the battery voltage is checked. If the voltage is less than approximately 2.5V, an internal Battery Not OK (BOK) flag will be set. The BOK flag can be checked after power up. If the BOK flag is set, the first write attempted will be blocked. The flag is automatically cleared after the first write, and normal RAM operation resumes. Figure 9 illustrates how a BOK check routine could be structured. For more information on Battery Storage Life refer to the Application Note AN1012. Figure 10. Supply Voltage Protection AI02169 VCC 0.1 µF DEVICE VCC VSS Figure 9. Checking the BOK Flag Status READ DATA AT ANY ADDRESS AI00607 IS DATA COMPLEMENT OF FIRST READ? (BATTERY OK) POWER-UP YES NO WRITE DATA COMPLEMENT BACK TO SAME ADDRESS READ DATA AT SAME ADDRESS AGAIN NOTIFY SYSTEM OF LOW BATTERY (DATA MAY BE CORRUPTED) WRITE ORIGINAL DATA BACK TO SAME ADDRESS (BATTERY LOW) CONTINUE POWER SUPPLY DECOUPLING and UNDERSHOOT PROTECTION ICC transients, including those produced by output switching, can produce voltage fluctuations, re- sulting in spikes on the VCC bus. These transients can be reduced if capacitors are used to store en- ergy, which stabilizes the VCC bus. The energy stored in the bypass capacitors will be released as low going spikes are generated or energy will be absorbed when overshoots occur. A ceramic by- pass capacitor value of 0.1µF (as shown in Figure 10) is recommended in order to provide the need- ed filtering. In addition to transients that are caused by normal SRAM operation, power cycling can generate neg- ative voltage spikes on VCC that drive it to values below VSS by as much as one Volt. These nega- tive spikes can cause data corruption in the SRAM while in battery backup mode. To protect from these voltage spikes, it is recommended to con- nect a schottky diode from VCC to VSS (cathode connected to VCC, anode to VSS). Schottky diode 1N5817 is recommended for through hole and MBRS120T3 is recommended for surface mount. |
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