Electronic Notice Board

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  • Topic: GSM, Power supply, Direct current
  • Pages : 7 (1058 words )
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  • Published : January 24, 2013
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SMS BASED WIRELESS
NOTICE BOARD

1. SPECIFICATION
1.1)AT89S52 MICROCONTROLLER:
MAJOR SPECIFICATIONS:
• 8K Bytes of In-System Programmable (ISP) Flash Memory
– Endurance: 1000 Write/Erase Cycles
• 4.0V to 5.5V Operating Range
• Fully Static Operation: 0 Hz to 33 MHz
• Three-level Program Memory Lock
• 256 x 8-bit Internal RAM
• 32 Programmable I/O Lines
• Three 16-bit Timer/Counters
• Eight Interrupt Sources
• Full Duplex UART Serial Channel
• Low-power Idle and Power-down Modes
• Interrupt Recovery from Power-down Mode
• Watchdog Timer
• Dual Data Pointer
• Power-off Flag
• Fast Programming Time
• Flexible ISP Programming (Byte and Page Mode)
• Green (Pb/Halide-free) Packaging Option
1.2)MAX232 IC:

MAJOR SPECIFICATIONS:
Input supply voltage range, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to 6V Positive output supply voltage range, VS+ . . . . . . . . . . . . . . . . . . . . . VCC − 0.3 V to 15 V Negative output supply voltage range, VS− . . . . . . . . . . . . . . . . . . . −0.3 V to −15 V Input voltage range, VI: Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to VCC + 0.3 V Receiver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30 V Output voltage range, VO: T1OUT, T2OUT . . . . . . . . . . . . . . . VS−( − 0.3 V) to VS+( +0.3) V R1OUT, R2OUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −0.3 V to VCC + 0.3 V Short-circuit duration: T1OUT, T2OUT . . . . . . . . . . . . . . . . . . . . . . . . . Unlimited Package thermal impedance, θJA : D package . . . . . . . . . . . . . . . . . . 73C/W DW package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57C/W N package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67C/W NS package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64C/W Operating virtual junction temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . 150C Storage temperature range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −65C to 150C 1.3)7805 VOLTAGE REGULATOR

MAJOR SPECIFICATIONS:
PARAMETER TEST CONDITIONS MIN TYP MAX

Output voltage(V) IO = 5 mA to 1 A,
V1 = 7 V to 20 V, 4.8 5 5.2 PD ≤15 W

V1 = 7 V to 25 V 3 100 Input voltage regulation (mV)
V1 = 8V to 12V 1 50

Io = 5mA to 1.5 A 15 100 Output voltage regulation
(mV) Io = 250mA to 750mA 5 50

Output resistance(ohm) f = 1kHz 0.017

Temperature coefficient Io = 5 mA -1.1 of output voltage
(mV/degC)

Output noise voltage f = 10 to 100kHz 40 (microV)

Bias current (mA) 4.2 8...
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