TLE7235EM Infineon Technologies, TLE7235EM Datasheet - Page 13

• Manufacturer Part Number: TLE7235EM
• Description: IC DRIVER SPI RELAY CTRL 24SSOP
• Manufacturer: Infineon Technologies
• Series: -r
• Type: High Side/Low Side Driverr

Specifications of TLE7235EM

• Input Type: SPI
• Number Of Outputs: 8
• On-state Resistance: 900 mOhm, 1.6 Ohm
• Current - Output / Channel: 250mA, 500mA
• Current - Peak Output: -
• Voltage - Supply: 9 V ~ 16 V
• Operating Temperature: -40°C ~ 150°C
• Mounting Type: Surface Mount
• Package / Case: 24-LSSOP (0.154", 3.90mm Width)
• Packages: PG-SSOP-24
• Channels: 8.0
• Rds (on) (typ): 0.9 Ohm
• Vdd: 3.0 - 5.5 V
• Vds(cl): 41.0 - 52.0 V
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

5
The TLE7235EM is supplied by two supply voltages
feed and used by the power switches and by an integrated power supply for the register banks. There is an under
voltage reset function implemented for the
threshold. After start-up of the power supply, all SPI registers are reset to their default values and the device is in
sleep mode (standby). Sending the SPI command CMD.WAKE = 1 switches the device to operation mode (ON),
while a command CMD.STB = 1 send the device to sleep mode (standby) again. Please note that the device
needs the time
CMD.WAKE = 1 before this time is elapsed. A SPI frame send during
The
result, the daisy chain function is available as soon as
A capacitor between pins
Please see
5.1
There is a limp home functionality implemented in the TLE7235EM, which is activated via pin LHI. Please refer to
Section 5.2
The device provides a sleep mode (stand by) to minimize current consumption, which also resets the register
banks. It is entered and left by dedicated SPI commands . The sleep mode current is minimized only when limp
home is inactive. After limp home, the device enters sleep mode automatically.
The following table shows the operation modes depending on
Operation Modes
VBB
VDD
LHI
Switches operating
Limp Home
SPI & daisy-chain
Register Banks
Diagnostic functions
5.2
The TLE7235EM offers the capability of driving dedicated channels during fail-safe operation of the system. This
limp home mode is activated by a high signal at pin LHI. In limp home mode, the SPI registers are reset and the
input pins are directly routed to the auto configuring channels (channel 4 and 5). As a result, the limp home
operation can be chosen for high-side and low-side driven loads. Due to the integrated power supply, limp home
operation is independent of digital power supply
device. After limp home operation, the device enters sleep mode in any case.
5.3
There are several reset trigger implemented in the device. A reset switches off all channels and sets the registers
to default values. After any kind of reset, the transmission error flag (TER) is set and the device is in sleep mode.
Under Voltage Reset:
Data Sheet
V
DD
supply line is used to power the circuitry related to the SPI shift register and for driving the SO line. As a
Figure 14 “Application Diagram” on Page 34
for details.
Power Supply
Operation Modes
Limp Home Mode
Reset
t
wu(Sleep)
to initialize itself. No SPI command should be send after changing the power state via
V
DD
and GND is recommended (especially in case of EMI disturbances).
0 V
0 V
X
-
-
-
reset
-
V
bb
power supply, which is triggered if
0 V
5 V
0 V
-
-
reset
-
V
DD
. In case of stand-by, a high signal at pin LHI will wake up the
V
V
bb
13
DD
and
is provided in the specified range independent of
0 V
5 V
5 V
-
-
reset
-
for details.
V
V
SPI Driver for Enhanced Relay Control
DD
bb
,
. The
V
DD
t
12 V
0 V
0 V
-
-
wu(Sleep)
and the limp home input signal LHI.
V
bb
supply line is connected to a battery
could be ignored.
12 V
0 V
5 V
-
reset
-
V
bb
is below the undervoltage
Rev. 1.1, 2011-04-05
12 V
5 V
0 V
-
TLE7235EM
Power Supply
12 V
5 V
5 V
reset
-
V
bb
.