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TC514COI Fiches technique(PDF) 5 Page - Microchip Technology

No de pièce TC514COI
Description  Precision Analog Front Ends
Download  28 Pages
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Fabricant  MICROCHIP [Microchip Technology]
Site Internet  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC514COI Fiches technique(HTML) 5 Page - Microchip Technology

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© 2002 Microchip Technology Inc.
DS21428B-page 5
TC500/A/510/514
2.0
PIN DESCRIPTIONS
Thedescriptionsof the pins arelistedinTable2-1.
TABLE 2-1:
PIN FUNCTION TABLE
Pin Number
(TC500,
TC500A)
Pin
Number
(TC510)
Pin
Number
(TC514)
Symbol
Description
12
2
CINT
Integrator output. Integrator capacitor connection.
2
Not Used Not Used
VSS
Negative power supply input (TC500/TC500A only).
33
3
CAZ
Auto Zero input. The Auto Zero capacitor connection.
4
4
4
BUF
Buffer output. The Integrator capacitor connection.
5
5
5
ACOM
This pin is grounded in most applications. It is recommended that ACOM and the
input common pin (Ven-or CHn-) be within the analog common mode range (CMR).
66
6
CREF-
Input. Negative reference capacitor connection.
77
7
CREF+
Input. Positive reference capacitor connection.
88
8
VREF-
Input. External voltage reference (-) connection.
99
9
VREF+
Input. External voltage reference (+) connection.
10
15
Not Used
VIN-
Negative analog input.
11
16
Not Used
VIN+
Positive analog input.
12
18
22
A
Input. Converter phase control MSB. (See input B.)
13
17
21
B
Input. Converter phase control LSB. The states of A, B place the TC5XX in one of
four required phases. A conversion is complete when all four phases have been
executed:
Phase control input pins: AB = 00: Integrator Zero
01: Auto Zero
10: Integrate
11: De-integrate
14
19
23
CMPTR
OUT
Zero crossing comparator output. CMPTR is HIGH during the Integration phase
when a positive input voltage is being integrated and is LOW when a negative input
voltage is being integrated. A HIGH-to-LOW transition on CMPTR signals the pro-
cessor that the De-integrate phase is completed. CMPTR is undefined during the
Auto Zero phase. It should be monitored to time the Integrator Zero phase.
15
23
27
DGND
Input. Digital ground.
16
21
25
VDD
Input. Power supply positive connection.
22
26
CAP+
Input. Negative power supply converter capacitor (+) connection.
24
28
CAP-
Input. Negative power supply converter capacitor (-) connection.
11
VOUT-
Output. Negative power supply converter output and reservoir capacitor connection.
This output can be used to power other devices in the circuit requiring a negative
bias voltage.
20
24
OSC
Oscillator control input. The negative power supply converter normally runs at a fre-
quency of 100kHz. The converter oscillator frequency can be slowed down
(to reduce quiescent current) by connecting an external capacitor between this pin
and VDD (see Section 9.0, Typical Characteristics Curves).
18
CH1+
Positive analog input pin. MUX channel 1.
13
CH1-
Negative analog input pin. MUX channel 1.
17
CH2+
Positive analog input pin. MUX channel 2.
12
CH2-
Negative analog input pin. MUX channel 2.
16
CH3+
Positive analog input pin. MUX channel 3.
11
CH3-
Negative analog input pin. MUX channel 3.
15
CH4+
Positive analog input pin. MUX channel 4.
10
CH4-
Negative analog input pin. MUX channel 4
20
A0
Multiplexer input channel select input LSB (see A1).
19
A1
Multiplexer input channel select input MSB.
Phase control input pins: A1, A0 = 00 = Channel 1
01 = Channel 2
10 = Channel 3
11 = Channel 4


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