Rainbow Electronics AT73C502 - Manual (Page 3)

AT73C500
3
Pin Description
AT73C501 Single-ended ADC
Figure 3. PLCC-28 package pin layout
Power
Supply
Pins Pin I/O Description
VDDA 13 PWR Analog Supply, Positive, +5V
VSSA 12 PWR Analog Supply, Negative, 0V
VDA 21 PWR Analog Supply, Positive, +5V
VSA 20 PWR Analog Supply, Negative, 0V
AGND 9 PWR
Analog Ground Reference
Input
VREF 11 PWR
Reference Voltage
Output/Input
VCC 7 PWR Digital Supply, Positive, +5V
VGND 23 PWR Digital Supply, Negative, 0V
Crystal Osc
Signals Pin I/O Description
XI 3 I Crystal Oscillator Input
XO 4 O Crystal Oscillator Output
RESET
DATA FSR ACK CLKR CLK XI XO
25
26 27 28 1 2
N/C
3 4
24
VGND 23
PD 22
VDA 21
VSA 20
AIN5 19
VSSA VDDA AIN2 AIN4 AIN6 AIN1 AIN3
18 17 16 15 14 13 12
BGD
CS
VCC
PFAI
AGN
VCIN
VREF
5
6
7
8
9
10
11
Analog
Signals Pin I/O Description
AIN1 17 I Current, Channel 1
AIN2 14 I Voltage, Channel 1
AIN3 18 I Current, Channel 2
AIN4 15 I Voltage, Channel 2
AIN5 19 I Current, Channel 3
AIN6 16 I Voltage, Channel 3
VCIN 10 I
Input to Voltage Monitoring
Block
Digital
Control
Signals
Pin I/O Description
BGD 5 I
By-pass Control
for Reference Voltage
CS 6 I Chip Select Input
PD 22 I
Power Down Control
for A/D Modulators
N/C 24 I Connect to VGND
RESET 25 I Reset Input, Active High
Status
Flags Pin I/O Description
PFAIL 8 O
Output of Voltage Monitoring
Block
Output Bus
Signals Pin I/O Description
CLK 2 O Master Clock Output
CLKR 1 O Serial Bus Clock Output
DATA 26 O Serial Data Output
FSR 27 O
Output Sample Frame
Signal
ACK 28 O
Data Ready Acknowledge
Output