
C8051F040/1/2/3/4/5/6/7
Rev. 1.5 37
4. Pinout and Package Definitions
Table 4.1. Pin Definitions
Name
Pin Numbers
Type Description
F040/2/4/6 F041/3/5/7
V
DD
37, 64, 90 24, 41, 57 Digital Supply Voltage. Must be tied to +2.7 to +3.6 V.
DGND 38, 63, 89 25, 40, 56 Digital Ground. Must be tied
to Ground.
AV+ 8, 11, 14 3, 6 Analog Supply Voltage. Must be tied to +2.7 to +3.6 V.
AGND 9, 10, 13 4, 5 Analog Ground. Must be tied to Ground.
TMS 1 58 D In JTAG Test Mode Select with internal pullup.
TCK 2 59 D In JTAG Test Clock with internal pullup.
TDI 3 60 D In JTAG Test Data Input with internal pullup. TDI
is latched
on the rising edge of TCK.
TDO 4 61 D Out JTAG Test Data Output with internal pullup. Data is
shif
ted out on TDO on the falling edge of TCK. TDO out-
put is a tri-state driver.
/RST 5 62 D I/O Device Reset. Open-drain outpu
t of internal V
DD
monitor.
Is driven low when V
DD
is < 2.7 V and MONEN is high. An
external source can initiate a system reset by driving this
pin low.
XTAL1 26 17 A In Crystal Input. This pin is the return for the internal
oscilla-
tor circuit for a crystal or ceramic resonator. For a preci-
sion internal clock, connect a
crystal or ceramic resonator
from XTAL1 to XTAL2. If overdriven by an external CMOS
clock, this becomes the system clock.
XTAL2 27 18 A Out Crystal Output. This pin is the excitation driver for a crystal
or ceramic
resonator.
MONEN 28 19 D In V
DD
Monitor Enable. When tied high, this pin enables the
internal V
DD
monitor, which forces a system reset when
V
DD
is < 2.7 V. When tied low, the internal V
DD
monitor is
disabled.
In most applications, MONEN should be connected
di
rectly to V
DD
.
VREF 12 7 A I/O Bandgap Voltage Reference Output (all devices).
DAC Voltage Reference Input (C8051F041/3 only).
VREFA 8 A In ADC0 (C8051F041/3/5/7) and ADC2 (C8051F041/3 only)
Voltage Reference Input.
VREF0 16 A In ADC0 Voltage Reference Input.
VREF2 17 A In ADC2 Voltage Reference Input (C8051F040/2 only).
VREF 15 A In DAC Voltage Reference Input (C8051F040/2 only).
AIN0.0 18 9 A In ADC0 Input Channel 0 (See ADC0 Specification for com-
plete description).