5V PRECISION DATA ACQUISITION
SUBSYSTEMS
1
2
3
4
5
6
7
8
TC530
TC534
PIN DESCRIPTION (Cont.)
Pin No.
(TC530
28-Pin
Pin No. Pin No
Pin No.
(TC534
44-Pin
PQFP)
(TC530
28-Pin
(TC534
40-Pin
PDIP)
PDIP, 300 Mil.) SOIC)
Symbol Description
22
22
32
30
VCCD
Analog Input. Power supply connection for digital logic and
serial port. Proper power-up sequencing is critical, see the
Applications section.
23
23
34
32
OSC
Input. The negative power supply converter normally runs at
a frequency of 100kHz. This frequency can be slowed down to
reduce quiescent current by connecting an external capacitor
between this pin and VS+. (See Typical Characteristics).
25
26
25
26
37
38
35
36
VDD
Analog Input. Power supply connection for the A/D analog
section and DC-DC converter. Proper power-up sequencing is
critical, see the Applications section.
CAP+
Analog Input. Storage capacitor positive connection for the
DC/DC converter.
27
28
27
28
39
40
37
38
AGND
CAP–
Analog Input. Ground connection for DC/DC converter.
Analog Input. Storage capacitor negative connection for the
DC/DC converter.
13, 24
13, 24
28, 29, 31, 1, 25, 26, 27
33, 35, 36 29, 31, 33,
34, 39, 44,
NC
No connect. Do not connect any signal to these pins.
READ TIMING
tRS
WRITE TIMING
WRITE DEFAULT TIMING
R/W
tRD
R/W
DIN
R/W
tLS
tLDL
EOC
DIN
tDLS
tLDS
DOUT
tPWL
tDRS
DCLK
tPWL
DCLK
READ FORMAT
R/W
EOC
DOUT
EOC OVR SGN MSB
LSB
DCLK
WRITE FORMAT
R/W
DOUT
MSB
LSB
DCLK
For Polled vs Interrupt Operation and Write Value Modified Cycle Use TC520A Data Sheet Figure 1 & 2.
Figure 1. Serial Port Timing
TELCOM SEMICONDUCTOR, INC.
3-53
TELCOM [ TELCOM SEMICONDUCTOR, INC ]
