参数资料
型号: TLE7719-T
厂商: INFINEON TECHNOLOGIES AG
元件分类: 模拟信号调理
英文描述: SPECIALTY ANALOG CIRCUIT, PDSO28
封装: PLASTIC, TSSOP-28
文件页数: 15/75页
文件大小: 1485K
代理商: TLE7719-T
TLE7719-T
Functional Block Description
Data Sheet
22
V1.1, 2004-09-13
3.1.2
Biasing
TLE7719-T provides an internally generated bandgap reference voltage. All internally
used precise voltages or currents are derived from the bandgap voltage.
The pin [IREF] is the output of the internal 2.05V precision reference voltage. An external
precision 20.5k resistor applied between this pin and [GNDA] provides a 100A
reference current that is used to generate the internal reference currents.
Figure 4
Bias Current Block
In case of loss of the external resistor the biasing is switched over to an internally
generated Emergency Bias Mode. In this case the specified parameter values can be
exceeded. Operation in Emergency Bias Mode can be detected by the microcontroller,
as in this case the Satellite failure register (SFR) is set to “FFH” (see Section 4.1.1.2).
Additionally, the voltage between [GNDA] and [GNDD] is monitored as well. Exceeding
the trigger value for the voltage difference is indicated in the same way as loosing the
external biasing.
Pos.
Parameter
Symbol
Limit Values
Unit Test Conditions
min.
typ.
max.
3.1.12
Reference voltage
at IREF
V
REF
-4%
2.05
+4%
V
R
IREF = 20.5k
Reference Current-Sources
-
+
VC5 (+4.8V)
GND
Biasing
Current Generator
R
IREF
GND
20.5k
2.05V
22
GNDA
23
IREF
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