ISL32172E, ISL32272E, ISL32174E, ISL32179E
Pin Configurations(Continued)
ISL32179E
(24 LD QFN)
TOP VIEW
24 23 22 21 20 19
Z1
EN1
EN2
EN
1
2
3
4
5
6
18 Y4
17 Z4
16 EN4
15 EN3
14 EN
13 Z3
Z2
Y2
7
8
9
10 11 12
Pin Descriptions
PIN
FUNCTION
EN, EN
Group driver output enables that are internally pulled high to V
.
CC
All ISL32x72E driver outputs, Y and Z, are enabled by driving EN high OR EN low. The outputs are high impedance when EN is low AND EN
is high (for example, if using only the active high EN, connect EN directly to V or V ; if using only the active low EN, connect EN directly
CC
L
to GND).
To use group enable on the ISL32179E, connect all the ENX pins to V or V and use the EN or EN pin as previously described. If the group
CC
L
driver enable function is not required (see Note 4), connect EN to V , or connect EN to GND (ISL32x72E and ISL32179E only).
CC
EN12, EN34 Paired driver output enables that are internally pulled high to V . Driving EN12 (EN34) high enables the Channel 1 and 2 (3 and 4) outputs
CC
(Y and Z). Driving EN12 (EN34) low disables Channel 1 and 2 (3 and 4) outputs. If the driver enable function is not required (see Note 4),
connect EN12 and EN34 to V (ISL32174E only).
CC
ENx
Individual driver output enables that are internally pulled high to V . Forcing ENx high with EN high OR EN low enables the channel X
CC
outputs (Y and Z). Driving ENX low disables the Channel X outputs regardless of the states of EN and EN. Connect both EN and EN to V
CC
for the lowest SHDN current if using SHDN mode (see SHDNEN below). If the individual driver enable function is not required (see Note 4),
connect ENX to V (ISL32179E only).
CC
SHDNEN Low power SHDN mode enable. A high level allows the ISL32179E to enter a low power mode when all channels are disabled. A low level
prevents the device from entering the low power mode (ISL32179E only).
DIx
Driver input. A low on DI forces the corresponding channel’s output Y low and output Z high. A high on DI forces output Y high and output
Z low.
SPA, SPB Speed select inputs that are internally pulled high. See the ISL32179E truth table on page 4 (ISL32179E only).
GND
Yx
Ground connection. This is also the potential of the QFN thermal pad.
±16.5kV IEC61000-4-2 ESD protected RS-422 level and a noninverting transmitter output.
±16.5kV IEC61000-4-2 ESD protected RS-422 level and an inverting transmitter output.
Zx
V
System power supply input (3.0V to 5.5V). Power up V first on devices with a V pin powered from a separate supply.
CC
CC
L
V
Logic power supply input. Connecting the V pin to the lower voltage power supply of a logic device (such as a UART or microcontroller)
L
L
interfacing with the ISL32179E configures its logic pin (DI, EN (all varieties), SHDNEN, and SP) V /V levels to values compatible with the
IL IH
lower supply voltage. If V and V are different supplies, power up this supply after V and keep V ≤ V . (ISL32179E only)
CC CC CC
L
L
EP
NOTE:
Thermal pad. Connect EP to GND (ISL32179E only).
4. Tie unused EN pins with a 1k resistor to V
.
CC
FN6824 Rev 4.01
Mar 19, 2020
Page 5 of 21