MB4053 Datasheet, PDF (3/17 Pages) Fujitsu Component Limited. – 6-Channel 8-BIT A/D Converter

MB4053
s PIN DESCRIPTION
Pin no.
9 to 13
15
16
1
2
3
7
4
8
6
14
5
Pin name Symbol
Function
Analog
input
I1 thru I6
Analog inputs for the six channels. One of the 6 is selected by a specific
bit pattern on A0 to A2.
Channel
selection
input
A0
Input for selecting an analog input channel. Either GND, one of
A1
channels I1 to I6 or VREF is selected by a specific bit pattern on the 3
A2
inputs.
RAMP
START
signal
input
RAMP START A/D conversion start signal input. RAMP START (1 → 0)
Ramp time start signal input. RAMP START (0 → 1)
RAMP
STOP
signal
output
RAMP STOP Indicates that CH is charged over comparator reference voltage VBE2.
RAMP STOP (0 → 1) A/D conversion end signal (CH discharged to
comparator reference voltage). RAMP STOP (0 → 1)
Ramp
capacitor
pin
CH
Pin for externally connecting the ramp capacitor. The value of CH in
conjunction with VREF and RREF establishes the ramp time.
Reference
voltage
supply pin
VREF
Reference voltage supply pin.
This is the reference voltage source for determining the discharge
current and the analog reference voltage for full-scale factor correction.
When the channel selection input is set 111, this pin is selected for
channel conversion. The full-scale factor is corrected using the
conversion results.
The voltage at this pin must be set to (GND + 2 V) to (VCC – 2 V) and
5.25 V or less.
Reference
resistance
pin
RREF
Pin for external reference resistance for setting the discharge current.
The external resistance is connected between the power source pin
(VCC) and the reference resistance pin (RREF). The discharge current is,
then, IR = (VCC – VREF)/RREF.
Power
supply
VCC
Power supply pin
Ground
GND
Ground pin
This pin is grounded. When the channel selection input is set to 000,
this terminal is selected for channel conversion. The zero offset is
corrected using the conversion results.
3