TP-UART-IC

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25.15.10.41.33a

25.10.01

page

4

1.2

DC and AC Characteristics

The following parameters are valid in the ambient temperature range

ϑ

and for bus voltage VB+ = 20 to 33 V if it is not otherwise declared. When the bus voltage is

lower than 20 V and no RESET is active then the normal functionality must be fulfilled, but

the parameters may be outside the limits.

1.2.1 Bus Pins VB+ and VB- (Pins 10, 11)

Via these pins the ASIC is connected to the bus line. VB- represents the reference potential.

Symbol

Parameter

Min

Max

Unit Note

positive line voltage

-0.5

45

V

1)

current consumption in analog mode (without clock)

1

mA

current consumption in normal mode (with clock)

1.6

mA

4,9152 MHz

1) during surge impulse is allowed and guaranteed by ext. Elements: -20 V for 2 µs and 65 V for 150 µs

1.2.2 Buffer Voltage VSP (Pin 9)

The ASIC delivers a supply voltage of 5 volts to external loads. In order to prevent a rapid

change of bus current as a result of a rapid change of the load an external capacitor at the

pin VSP is used for energy storage. The static voltage is adjusted to app. 8,8 V (8,2 ...9,2)

by an internal regulator.

Symbol

Parameter

Min

Max

Unit

Note

Energy buffer voltage

5.76

13

V

1)

External storage capacitor

80

µF

2)

2) recommended 100

µF; must be larger than the capacitor at VCC

1.2.3 Current Controlling Pin CSA (Pin 8)

An external capacitor at this pin prevents a quick change of ASIC current in case of quick

changing bus voltage VB+ or load current IVCC. The ASIC current changes with a rate of

max. 0,5 mA/ms (CCSA = 47 nF).

Symbol

Parameter

Min

Max

Unit

Note

CCR

0.2

0.5

mA/ms

1)