SAP51C-B-G1-T ZMDI, SAP51C-B-G1-T Datasheet - Page 14

• Manufacturer Part Number: SAP51C-B-G1-T
• Description: Interface - Specialized ASI
• Manufacturer: ZMDI

Specifications of SAP51C-B-G1-T

• Rohs: yes
• Product Type: Actuator Sensor Interface IC
• Operating Supply Voltage: 16 V to 34 V
• Supply Current: 6 mA
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• Package / Case: SOP-16
• Minimum Operating Temperature: - 25 C

2
2.1. Functional Block Diagram
Following device functions are associated with the different blocks of the IC:
Data Sheet
October 20, 2011
OSC1
OSC2
RECEIVER
TRANSMITTER
LTGN
LTGP
CDC
U5R
SAP5S / SAP51
Universal Actuator-Sensor Interface IC
Basic Functional Description
© 2011 Zentrum Mikroelektronik Dresden AG — Rev. 3.0
All rights reserved. The material contained herein may not be reproduced, adapted, merged, translated, stored, or used without
the prior written consent of the copyright owner. The information furnished in this publication is PRELIMINARY and subject to
changes without notice.
The receive block converts the analog telegram waveform from the AS-i bus to a digital
pulse coded signal that can be processed further by a digital UART circuit.
The RECEIVE block is directly connected to the AS-i line pins LTGP and LTGN. It
converts the differential AS-i telegram to a single ended signal and removes the DC offset
by high pass filtering. To adapt quickly on changing signal amplitudes in telegrams from
different network users, the amplitude of the first telegram pulse is measured by a 3 bit
flash ADC and the threshold of a positive and a negative comparator is set accordingly to
about 50% of the measured level. The comparators generate the P-Pulse and N-Pulse
signals.
The transmit block transforms a digital response signal to a correctly shaped send current
signal which is applied to the AS-i bus. Due to the inductive network behavior of the
network the changing send current induces voltage pulses on the network line that overlay
the DC operating voltage. The voltage pulses shall have sin²-wave shapes. Hence, the
send current shape must follow the integral of the sin²-wave function.
OSCILLATOR
Fail Detector
Transmitter
Electronic
Receiver
Inductor
Supply
Power
Power
PLL
Figure 3: Functional Block Diagram
clk
MAN
pos
neg
Protection
Thermal
UART
APF
EEPROM
Machine
State
Main
PFAULT
Param
Offset
Offset
DSTB
PSTB
Data
LED
Output
Output
Input
I / O
I / O
I / O
UOUT
P3 ... P0
D3 ... D0
LED2, LED1
DSTBn
PSTBn
PFAULT
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