Document
CAT515
8-Bit Quad Digital POT with Independent Reference Inputs FEATURES
s Output settings retained without power s Independent Reference Inputs s Output range includes both supply rails s Programming voltage generated on-chip s 4 independently addressable outputs s Serial µP interface s Single supply operation: 2.7V-5.5V
APPLICATIONS
s Automated product calibration. s Remote control adjustment of equipment s Offset, gain and zero adjustments in Self-
Calibrating and Adaptive Control systems.
s Tamper-proof calibrations.
DESCRIPTION
The CAT515 is a quad 8-Bit Memory DAC designed as an electronic replacement for mechanical potentiometers and trim pots. Intended for final calibration of products such as camcorders, fax machines and cellular telephones on automated high volume production lines and systems capable of self calibration, it is also well suited for applications were equipment requiring periodic adjustment is either difficult to access or located in a hazardous environment. The CAT515 offers 4 independently programmable DACs each having its own reference inputs and each capable of rail to rail output swing. Output settings, stored nonvolatile EEPROM memory, are not lost when the device is powered down and are automatically reinstated when power is returned. Each output can be dithered to test new output values without effecting the stored settings and stored settings can be read back without disturbing the DAC’s output. FUNCTIONAL DIAGRAM
RDY/BSY 5 SERIAL DATA OUTPUT
VDD
Control of the CAT515 is accomplished with a simple 3 wire serial interface. A Chip Select pin allows several CAT515's to share a common serial interface and communications back to the host controller is via a single serial data line thanks to the CAT515’s Tri-Stated Data Output pin. A RDY/BSYoutput working in concert with an internal low voltage detector signals proper operation of EEPROM Erase/Write cycle. The CAT515 operates from a single 3–5 volt power supply. The high voltage required for EEPROM Erase/ Write operations is generated on-chip. The CAT515 is available in the 0°C to 70°C Commercial and –40°C to +85°C Industrial operating temperature ranges and offered in 20-pin plastic DIP and Surface mount packages.
PIN CONFIGURATION
8
DO
3
DIP Package (P)
VREF H4 VREF H1 DVD CLK RDY/BSY CS DI 1 2 3 4 5 6 7 8 9 10 20 19 18 17
CAT515
SOIC Package (J)
1 2 3 4 5 6 7 8 9 10
CAT515
2 PROG 9 PROGRAM CONTROL EEPROM LATCH
DAC 1
V REF H1 VOUT 1 V REF L1 VREF H2 VOUT 2 VREF L2 V REF H3 VOUT 3 V REF L3 V REF H4 VOUT 4 V REF L4
VREF H3 VREF H4 VREF H4 V REF H1 VOUT1 VOUT2 VOUT3 VOUT4 VREF L4 VREF L3 VREF L2 VREF L1 DVD CLK RDY/BSY CS DI DO PROG GND
20 19 18 17 16 15 14 13 12 11
VREF H3 VREF H4 VOUT1 VOUT2 VOUT3 VOUT4 VREF L4 VREF L3 VREF L2 VREF L1
18 11 1
CLK
4 DATA CONTROLLER
EEPROM LATCH
DAC 2
17 12 20
CS
6
16 15 14 13 12 11
DI
7
EEPROM LATCH
DAC 3
16 13
19 H.V. CHARGE PUMP EEPROM LATCH
DAC 4
DO PROG GND
15 14
CAT515
10 GND
© 2000 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice
1
Doc. No. 25077-00 2/98 M-1
CAT515
ABSOLUTE MAXIMUM RATINGS Supply Voltage* VDD to GND ...................................... –0.5V to +7V Inputs CLK to GND ............................ –0.5V to VDD +0.5V CS to GND .............................. –0.5V to VDD +0.5V DI to GND ............................... –0.5V to VDD +0.5V RDY/BSY to GND ................... –0.5V to VDD +0.5V PROG to GND ........................ –0.5V to VDD +0.5V VREFH to GND ........................ –0.5V to VDD +0.5V VREFL to GND ......................... –0.5V to VDD +0.5V Outputs D0 to GND ............................... –0.5V to VDD +0.5V VOUT 1– 4 to GND ................... –0.5V to VDD +0.5V Operating Ambient Temperature Commercial (‘C’ suffix) .................... 0°C to +70°C Industrial (‘I’ suffix) ...................... – 40°C to +85°C Junction Temperature ..................................... +150°C Storage Temperature ....................... –65°C to +150°C Lead Soldering (10 sec max) .......................... +300°C
* Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. Absolute Maximum Ratings are limited values applied individually while other parameters are within specified operating conditions, and functional operation at any of these conditions is NOT implied. Device performance and reliability may be impaired by exposure to absolute rating conditions for extended periods of time.
RELIABILITY CHARACTERISTICS Symbol
VZAP(1) ILTH(1)(2)
Notes:
Parameter
ESD Susceptibility Latch-Up
Min
2000 100
Max
Units
Volts mA
Test Method
MIL-STD-883, Test Method 3015 JEDEC Standard 17
1. This parameter is tested initially and after a design or process change that affects the parameter. 2. Latch-up protection is provided for stresses up to 100mA on address and data pins from –1V to VCC + 1V.
DC ELECTRICAL CHARACTERISTICS: VDD = +2.7V to +5.5V, VREFH = VDD, VREFL = 0V, unless .