ATA6621N-PGQW Atmel, ATA6621N-PGQW Datasheet - Page 16

• Manufacturer Part Number: ATA6621N-PGQW
• Description: TXRX LIN 5V REG WATCHDOG 20-QFN
• Manufacturer: Atmel
• Type: Transceiverr

Specifications of ATA6621N-PGQW

• Number Of Drivers/receivers: 1/1
• Protocol: LIN
• Voltage - Supply: 5 V ~ 18 V
• Mounting Type: Surface Mount
• Package / Case: 20-QFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

3.20
16
Temperature Monitor at Pin TEMP
ATA6621N
A microcontroller with an oscillator tolerance of ±15% is sufficient to supply the trigger inputs
correctly within the time period of t
Table 3-2.
In addition to the internal temperature monitoring of the voltage regulator, an additional sensor
measures the junction temperature and provides a linearized voltage at the TEMP pin. Together
with the analog functions of the microcontroller (for example, the analog comparator and the
Analog-to-digital converter (ADC)), this enables the application to detect overload conditions
and to take corresponding measures in order to prevent damage. An external capacitor buffers
the voltage due to the input current of the ADC.
The sensor itself is built out of three diodes which are supplied by an internal BIAS current in
Pre-normal mode and Normal mode. The typical voltage at T = 27°C is V
typical negative temperature coefficient of V
20 µA current source is switched off.
Figure 3-10. Temperature Monitor
Rwd_osc
120
k
10
51
91
Oscillator
Table of Watchdog Timings
Period
t
osc
12.5
22.4
2.6
29
/µs
t
113.7
Lead
Time
10.2
49.4
87.8
d
/ms
wd
V
TEMP
Window
Closed
CC
= 14.2 ms (±15%) in an application with R
17.92
t
2.08
23.2
1
10
/ms
TC,TEMP
Open Window
18.82
24.36
= –5.05 mV/k. In silent and sleep mode the
t
2.18
10.5
2
/ms
20 µA
Trigger Period from
microcontroller
t
25.45
32.94
wd
2.90
14.2
/ms
temp
wd_osc
4887I–AUTO–09/09
= 2.2V with a
= 51 k .
Reset time
t
nres
0.41
1.96
3.52
4.55
/ms