TLE7231G_15 Datasheet, PDF (11/30 Pages) Infineon Technologies AG – 4 channel low-side driver

SPI Driver for Enhanced Relay Control
SPIDER - TLE7231G
Power Supply
5
Power Supply
The TLE7231G is supplied by two power supply lines V_DD and V_DDA. The digital power supply line V_DD is designed
to be functional at a very wide voltage range. The analog power supply V_DDA supports 5 V supply.
Power-on reset functions have been implemented for both supply lines. After start-up of the power supply, all SPI
registers are reset to their default values and the device remains in idle mode. Capacitors between VDD and GND
pins, and VDDA and GND pins are recommended.
A reset pin is available. At low logic level at this pin, all registers are set to their default values and the quiescent
supply currents are minimized.
The V_DD supply line is used for the I/O buffer circuits of the SPI pins, therefore the voltage on the SO pin is always
related to this supply voltage. A capacitor between pins V_DD and GND is recommended (especially in case of EMI).
To enable the Daisy chain functionality it is necessary to have V_DD and V_DDA in the specified functional range.
The device provides a sleep mode to minimize current consumption, which also resets the register banks. It is
controlled by a low active reset pin (RST) which disables the device and minimize the current consumption. The
table below gives an overview of the different power modes.
Table 2 Power modes¹⁾
Power mode State Description
RESET
V_DD
(low active)
SLEEP
Device at minimum current consumption
low
X
IDLE
Device operational, all channels OFF no
high
ON
diagnosis activated
ON
Device operational with enabled channels and high
ON
diagnostic currents active
1) low: pin input is digital low,
high: pin input is digital high,
X: pin state don’t care,
ON: voltage on this analog supply pin is in the specified functional range
V_DDA SCLK
X
0 Hz
ON 0 Hz
ON 5 MHz
(max)
Datasheet
11
Rev. 1.2, 2014-05-09