Integration Manual

HMS1 Hardware Interface Description
Confidential / Preliminary
s
HMS1_HD_V01.62 Page 29 of 39 2006-08-21
Function Signal name IO Signal form and level Comment
RTC backup VDDLP I R
I
≈ 1kΩ
V
BATT+
= 0V:
V
I
= 1.5V…3.25V at I
max
= Tbd.
If unused keep pin open.
VUSB_IN I
V
IN
min = 3.2V
V
IN
max = 3.5V
USB
USB_DP
USB_DN
I/O
Differential Output Crossover voltage
Range
V
CRS
min = 1.3V, V
CRS
max = 2.0V
Pullup at USB_DP R
typ
=1.5kOhm
All electrical characteristics
according to USB
Implementers’ Forum, USB
1.1 Full Speed Specification.