PRODUCTION DATA – Apr 04, 2022
Table 7.2-2: Power Supply Electrical Parameters
No. Description Condition Symbol Min Typ Max Unit
1 Current consumption at VBAT
1)
V
VBAT
= 12V
I
DSIn
= 0mA
I
VBAT
9 15 mA
2 Current consumption at VCC I
VCC
4 10 mA
3 Current consumption at VIO
*)
I
VIO
1 mA
*)
Not tested in production
1)
I
VBAT
is the DSI master IC current at VBAT. Total current is calculated from I
master
+ Σ I
slaves
+ I
comm
(dynamic communication currents)
Voltage at pins VCC and VDSI are checked for undervoltage. The result is used as an interrupt source only (in
register IRQ_STAT). DSI communication is independent from status of undervoltage monitors.
Internal diodes are used to prevent current flowing from DSI pins to pins VDSI, VBAT and to the other DSI pin.
7.2.1 Digital Supply
The digital supply VDD18 requires an external blocking capacitor C
VDD18
. It is recommended to place the external
capacitor as close as possible to the related pins VDD18 and GND. VDD18 is not intended to supply any external
components. The VDD18 supply is monitored for power on reset signal generation.
7.2.2 Power Sequences
7.2.2.1 Power on Sequence
The IC begins to power up once an external voltage is supplied to the pin VCC.
1. The digital part is running after the internal power on reset (POR) signal is released.
POR is generated by monitoring the digital supply voltage (VDD18)
2. IC performs a number of self checks. Failing checks are indicated by interrupt activations.
3. SPI interface is ready for communication.
4. Communication via DSI3 interface is only possible if supply voltage at pin VBAT is available.
Pin RFC indicates IC communication state:
• pin is active low during power up and after a reset event
• pin remains low during initialization and self checking
• pin remains low as long as VDSI is in undervoltage
• pin becomes high if communication on SPI and DSI is possible
• pin remains high until next reset sequence, independent on VDSI voltage
The IC is ready for communication after t
startup
.
An active low state at pin RFC can be used as reset indication in host processor software. Any reset of the DSI
master IC will result in activation of the pin.
Table 7.2.2.1-1: Startup Parameters
No. Description Condition Symbol Min Typ Max Unit
1 time between VCC and VDSI are in recom-
mended operating condition ranges and IC
is ready for communication (RFC)
V
VCC
> V
VCC,min
V
VBAT
> V
VBAT,min
I
DSIn
stable
DSI_CFG.TRE = 1
t
startup
2 ms
ELMOS Semiconductor SE reserves the right to change the detail specifications as may be required to permit improvements in the design of its products.