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MAX3325 Datasheet(PDF) 6 Page - Maxim Integrated Products

Part No. MAX3325
Description  3V Dual RS-232 Transceiver with LCD Supply and Contrast Controller
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Maker  MAXIM [Maxim Integrated Products]
Homepage  http://www.maxim-ic.com
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 6 page
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3V Dual RS-232 Transceiver with
LCD Supply and Contrast Controller
6
_______________________________________________________________________________________
NAME
FUNCTION
1
C2+
Positive Terminal of Voltage-Inverting Charge-Pump Capacitor. Connect C2+ to C2- with a 0.22µF capacitor.
2
C2-
Negative Terminal of Voltage-Inverting Charge-Pump Capacitor. Connect C2- to C2+ with a 0.22µF capacitor.
PIN
3
V-
Output of Negative Charge Pump. Bypass V- to GND with a 0.22µF capacitor.
4, 5
R_IN
RS-232 Receiver Inputs
10
TEMP
Output of Temperature Sensor. Connect TEMP to FB with a series resistor to compensate LCD contrast for
changing temperature. Bypass TEMP with a 0.22µF capacitor to GND.
9
LCD
Output of Negative Regulator. Connect LCD to FB with a series resistor. Bypass with a 0.47µF capacitor to
GND.
8
VL
Supply Input for Receiver Outputs. Connect VL to the system logic supply voltage.
6, 7
R_OUT
TTL/CMOS Receiver Outputs
15
UP
DAC Adjust Input. A falling edge on
UP increments the internal 6-bit DAC counter.
14
DAC
Output of Internal 6-Bit DAC. Connect DAC to FB with a series resistor to adjust LCD voltage.
13
REF+
Output of Positive Reference, +1.2V. Bypass REF+ with a 0.22µF capacitor to GND.
12
FB
Feedback Input for Negative Regulator. Regulates when FB is at zero (0).
11
REF-
Output of Negative Reference, -1.2V. Bypass REF- with a 0.22µF capacitor to GND.
Pin Description
16
DOWN
DAC Adjust Input. A falling edge on
DOWN decrements the internal 6-bit DAC counter.
17
SDLCD
Active-Low Shutdown-Control Input for Both Regulators, References, DAC, and Temperature Sensors. Drive
SDLCD low to disable all analog circuitry. Drive high to enable the analog circuitry.
26
VDD
+3.0V to +3.6V Supply Voltage. Bypass VDD with a 0.22µF capacitor to GND.
25
GND
Ground
24
C1-
Negative Terminal of Voltage-Doubling Charge-Pump Capacitor. Connect C1- to C1+ with a 0.22µF capacitor.
18
SD232
Active-Low Shutdown-Control Input for Transmitter Outputs. Drive
SD232 low to disable the RS-232
transmitters. Drive high to enable the transmitters.
23
REG
Output of Positive Regulator. Bypass REG with a 4.7µF capacitor to GND.
21, 22
T_OUT
RS-232 Transmitter Outputs
19, 20
T_IN
TTL/CMOS Transmitter Inputs
28
C1+
Positive Terminal of Voltage-Doubling Charge-Pump Capacitor. Connect C1+ to C1- with a 0.22µF capacitor.
27
V+
Output of Positive Charge Pump. Bypass V+ to VDD with a 0.22µF capacitor.




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