IA82527_13 Datasheet, PDF (23/58 Pages) InnovASIC, Inc – Serial Communications Controller—CAN Protocol

IA82527
CAN Serial Communications Controller
Data Sheet
December 20, 2012
Table 3. Pin/Signal Descriptions (Continued)
Signal
ste
Pin
Name
PLCC
a3/ad3/ste
43
PQFP
37
Description
synchronization transmission enable. Input. Serial
interface Mode. The logic level at the ste pin enables
the transmission of the synchronization bytes through
the IA82527 miso pin while the master device
transmits the Address and Control Byte as follows:
• When a logic 0 is placed on the ste pin, the
synchronization bytes sent through the miso pin are
00H and 00H.
• When a logic 1 is placed on the ste pin, the
synchronization bytes sent through the miso pin are
AAH and 55H.
The IA82527 sends the synchronization bytes after the
cs_n signal has been asserted
tx0
tx0
26
20 Transmit (tx), lines 0 and 1. Output (push-pull). Pins
tx1
tx1
25
19 ^{tx0 and tx1 are the outputs from the IA82527 to the}
CAN bus lines.
V_CC
V_CC/2
V_CC
int_n/ V_CC/2
During a recessive bit, tx0 is high and tx1 is low.
During a dominant bit, tx0 is low and tx1 is high.
1
39 Power (V_CC). This pin provides power for the IA82527
device. It must be connected to a +5V DC power
source.
24
18 Reference Voltage, ISO Physical Layer (V_CC/2).
Output. The V_CC/2 pin provides a reference voltage for
the ISO low-speed physical layer:
V_SS1
V_SS2
wr_n
V_SS1
23
V_SS2
20
wr_n/wrl_n/r-w_n 7
• 2.38V DC (minimum) to 2.60V DC (maximum)
(V_CC = +5.0V; I_OUT ≤ 75 μA)
• 1.46V DC (minimum) to 1.688V DC (maximum)
(V_CC = +3.3V; I_OUT ≤ 75 μA)
This pin only functions as V_CC/2 when the MUX bit of
the CPU Interface Register (02H) is 1.
17 Ground, Digital (V_SS1). This pin provides the digital
ground (0V) for the IA82527. It must be connected to
a V_SS board plane.
14 Ground, Analog (V_SS2). This pin provides the ground
(0V) for the IA82527 analog comparator. It must be
connected to a V_SS board plane.
1 write. Input. Active Low. Mode 0. When wr_n is
asserted (low), it signals a write cycle.
IA211080504-07
Page 23 of 58
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