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PDF U2640B Data sheet ( Hoja de datos )
| Número de pieza | U2640B | |
| Descripción | Intemittent- and Wipe/ Wash Control | |
| Fabricantes | ATMEL Corporation | |
| Logotipo |  |
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U2640B
Intemittent- and Wipe/ Wash Control for Wiper Systems
Description
With the U264xB, Atmel Wireless & Microcontrollers
developed a family of intermittent- and wipe/wash con-
trol circuits for windshield or backlite wiper systems with
identical basic functions. The circuit design provides the
possibility to generate ”x” versions using different metal-
lization masks. Thus, it is easy to verify a broad range of
time sequences which can be set independently of each
other.
Features
D Relay activation can be controlled by a limit switch of
the wiper motor or by a fixed activation period for
systems without limit switch
D Debounced input stages
D Enable/disable of pre-wash delay by program pin
D Polarity of WIWA: VBatt
D Polarity of INT: VBatt
D Relay output is protected with a clamping diode
D Relay activation: 0.48 s
D Interval pause: 5.8 s
D After wiping:
5.2 s
D Pre-wash delay: 0.52 s
D Wipe/wash mode with priority
D Protected in accordance to ISO/TR 7637–1
D EMC with intergrated filters
Block Diagram
VS
OSC
Voltage
stabilization
and
POR
Oscillator
INT
WIWA
LS
PP
21 V
21 V
21 V
Input
comparator
21 V
Logic
Load-
dump
detection
and
output
control
Open-collector
relay driver
21 V
REL
GND
Figure 1. Block diagram
Ordering Information
Extended Type Number
U2640B
U2640B–FP
Package
DIP8
SO8
13944
Remarks
Rev. A4, 03-Apr-01
1 (10)
1 page  
U2640B
Electrical Characteristics (continued)
Reference point Ground GND, Tamb = 25_C, VBatt = 13.5 V, unless otherwise specified (see figures 11 and 12)
Parameters
Test Conditions / Pin Symbol
Input limit switch LS
Pin 3
Internal protection-diode ILS = 10 mA
voltage
VLS
Internal capacitor
Switching threshold
voltage
CLS
VLS
Input current
Internal pull-up resistor
VLS = VS
External protection resistor
Inputs INT, WIWA and PP
ILS
RLS
RS
Pins 1, 2 and 4
Internal protection-diode IE = 10 mA
voltage
VE
Internal capacitor
Switching threshold
voltage
CE
VE
Input current
VE = 0 V
Internal pull-down resistor
External protection resistor
Relay output
Pin 6
–IE
RE
RS
Saturation voltage
Saturation voltage
Z-diode clamp voltage
Leakage current
Relay coil resistance
Load-dump protection
threshold
I = 100 mA
I = 200 mA
I = 10 mA
V = 14 V
VREL
VREL
VREL
IREL
RREL
VBatt
Internal pulse times
Debouncing period inputs
Debouncing period inputs
Relay activation time
Intermittent pause
After wiping period
Pre-wash delay, reaction
time for switch-on delay =
tDEL + tD
INT/WIWA 12 - 16 clocks
LS 3 – 4 clocks
96 clocks
1024 " 68 clocks
88 – 96 clocks
tD
tDL
tON
tINT
tWIWA
tDEL
Min
19.5
0.375 VS
13
10
19.5
0.375 VS
13
10
19.5
60
28
60
15
4.78
440
Typ
21.0
25
0.5 VS
20
21.0
25
0.5 VS
20
21.0
33
70
17.5
480
5.92
Max
25.5
0.675 VS
1
27
25.5
0.675 VS
1
27
1.1
1.5
25.5
12
42
80
20
5.46
480
Unit
V
pF
V
mA
kW
kW
V
pF
V
mA
kW
kW
V
V
V
mA
W
V
ms
ms
ms
s
s
ms
Note: All internally generated time sequences are derived from the oscillator frquency. The tolerances refer to a
frequency adjusted to fOSC = 200 Hz.
Rev. A4, 03-Apr-01
5 (10)
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet U2640B.PDF ] | |
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