ATA6824_08 ATMEL [ATMEL Corporation], ATA6824_08 Datasheet - Page 9

• Manufacturer Part Number: ATA6824_08
• Description: High Temperature H-bridge Motor Driver
• Manufacturer: ATMEL [ATMEL Corporation]

5.4
5.4.1
Figure 5-4.
4931E–AUTO–01/08
High Voltage Serial Interface
(input to transmitting Node)
(output of receiving Node 1)
(output of receiving Node 2)
TXD
RXD
RXD
V
(Transceiver
supply
of transmitting
node)
Transmit Mode
S
Definition of Bus Timing Parameters
TH
TH
TH
TH
Rec(max)
Dom(max)
Rec(min)
Dom(min)
A bi-directional bus interface is implemented for data transfer between hostcontroller and the
local microcontroller (SIO).
The transceiver consists of a low side driver (1.2V at 40 mA) with slew rate control, wave shap-
ing, current limitation, and a high-voltage comparator followed by a debouncing unit in the
receiver. In case of an active reset shown at pin /RESET the pin SIO is switched to low.
During transmission, the data at the pin TX will be transferred to the bus driver to generate a bus
signal on pin SIO. The pin TXD has a pull-down resistor included.
To minimize the electromagnetic emission of the bus line, the bus driver has an integrated slew
rate control and wave-shaping unit. Transmission will be interrupted in the following cases:
The recessive BUS level is generated from the integrated 30 k pull-up resistor in series with an
active diode. This diode prevents the reverse current of VBUS during differential voltage
between VSUP and BUS (V
• Thermal shutdown active
t
Bit
t
rx_pdf(1)
SIO Bus Signal
t
t
Bus_dom(min)
Bus_dom(max)
BUS
> V
SUP
).
t
Bit
t
rx_pdr(2)
t
Bus_rec(min)
t
Bus_rec(max)
t
rx_pdr(1)
t
Bit
Thresholds of
receiving node 1
Thresholds of
receiving node 2
t
rx_pdf(2)
ATA6824
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