Datasheet

Pin descriptions STM6600, STM6601
10/52 Doc ID 15453 Rev 11
PB - power ON switch
This input is equipped with a voltage detector with a factory-trimmed threshold and has
± 8 kV HBM ESD protection.
When the PB
button is pressed and held, the battery voltage is detected and EN (or EN) is
asserted if the battery voltage is above the threshold V
TH+
during the whole t
DEBOUNCE
period (see Figure 13).
A short push of the push-button during normal operation can initiate an interrupt through
debounced INT
output (see Figure 14) and a long push of PB and SR simultaneously can
either assert reset output RST
(see Figure 18) or deassert the EN or EN output (see
Figure 19) based on the option used.
Note: A switch to GND must be connected to this input (e.g. mechanical push-button, open drain
output of external circuitry, etc.), see Figure 1. This ensures a proper startup signal on PB
(i.e. a transition from full V
CC
below specified V
IL
). PB input has an internal 100 kΩ pull-up
resistor connected.
VCC
LO
- high threshold detection output
During power-up, VCC
LO
is low when V
CC
supply voltage is below the V
TH+
threshold. After
successful power-up (i.e. during normal operation) VCC
LO
is low anytime undervoltage is
detected (see Figure 13).
Output type is active low and open drain by default. Open drain output type requires a pull-
up resistor. A 10 kΩ is sufficient in most applications.
VCC
LO
is floating when STM660x is in standby mode.
PB
OUT
- PB input state
If the push-button PB
is pressed, the pin stays low during the t
DEBOUNCE
time period.
If PB
is asserted for the entire t
DEBOUNCE
period, PB
OUT
will then stay low for at least
t
INT_Min
. If PB is asserted after t
INT_Min
expires, PB
OUT
will return high as soon as PB is
deasserted (see Figure 22). PB
OUT
ignores PB assertion during an undervoltage condition.
At startup on the STM6601 PB
OUT
will respond only to the first PB assertion and any other
assertion will be ignored until t
ON_BLANK
expires. This output is active low and open drain by
default. Open drain output type requires a pull-up resistor. A 10 kΩ is sufficient in most
applications.