TC520A Datasheet, PDF (1/16 Pages) TelCom Semiconductor, Inc – SERIAL INTERFACE ADAPTER FOR TC500 A/D CONVERTER FAMILY

TC520A
Serial Interface Adapter for TC500 A/D Converter Family
Features
• Converts TC500/TC500A/TC510/TC514 to Serial
Operation
• Programmable Conversion Rate and Resolution for
Maximum Flexibility
• Supports up to 17-Bits of Accuracy Plus Polarity Bit
• Low Power Operation: Typically 7.5mΩ
• 14-Pin PDIP or 16-Pin SOIC Packages
• Polled or Interrupt Mode Operation
Applications
• Computer Peripheral Interface
• Portable Instruments
• Data Acquisition System Interface
Device Selection Table
Part Number
Package
Temperature Range
TC520ACOE 16-Pin SOIC (Wide)
0°C to +70°C
TC520ACPD 14-Pin PDIP
0°C to +70°C
Package Type
V_DD 1
DGND 2
CMPTR 3
B4
A⁵
OSC_OUT 6
OSC_IN 7
14-Pin PDIP
TC520A
14 _CE
13 DV
12 LOAD
11 D_IN
10 _DCLK
9 D_OUT
8 READ
General Description
The TC520A serial interface adapter provides logic
control for Microchip's TC500/TC500A/TC510/TC514
family of dual slope, integrating A/D converters. It
directly manages TC500 converter phase control sig-
nals A, B and CMPTR, thereby reducing host
processor task loading and software complexity. Com-
munication with the TC520A is accomplished over a 3
wire serial port. Key converter operating parameters
are programmable for complete user flexibility. Data
conversion is initiated when the CE input is brought
low. The converted data (plus overrange and polarity
bits) are held in an 18-bit shift register until read by the
processor or until the next conversion is completed.
Data may be clocked out of the TC520A at any time,
and at any rate, the user prefers. A Data Valid (DV) out-
put is driven active at the start of each conversion
cycle, indicating the 18-bit shift register update has just
been completed. This signal may be polled by the pro-
cessor or can be used as data ready interrupt. The
TC520A timebase can be derived from an external fre-
quency source of up to 6MHz or can operate from its
own external crystal. It requires a single 5V logic supply
and dissipates less than 7.5mΩ.
V_DD
DGND
CMPTR
B
A
OSC_OUT
OSC_IN
N/C
16-Pin SOIC
1
16 CE
2
15 DV
3
14 LOAD
4
13 D_IN
5 ^TC520A 12 DCLK
6
11 D_OUT
7
10 READ
8
9 N/C
© 2002 Microchip Technology Inc.
DS21431B-page 1